You're doing it right. 'adb pull' pulls the file from the tablet to your computer. Look in whatever path you ran adb from (on your computer) for recovery.log. You can upload the file or open it with notepad or your text editing tool of choice.
Okay, thanks. here's the log:
Starting recovery on Mon Apr 30 21:57:40 2012
framebuffer: fd 4 (1280 x 800)
recovery filesystem table
=========================
0 /tmp ramdisk (null) (null) 0
1 /configs ext2 /dev/block/mmcblk0p1 (null) 0
2 /system0 ext4 /dev/block/mmcblk0p2 (null) 0
3 /system1 ext4 /dev/block/mmcblk0p3 (null) 0
4 /cache ext4 /dev/block/mmcblk0p4 (null) 0
5 /misc emmc /dev/block/mmcblk0p5 (null) 0
6 /staging ext4 /dev/block/mmcblk0p6 (null) 0
7 /blflags ext4 /dev/block/mmcblk0p7 (null) 0
8 /datapp ext4 /dev/block/mmcblk0p8 (null) 0
9 /log ext4 /dev/block/mmcblk0p9 (null) 0
10 /data ext4 /dev/block/mmcblk0p10 (null) 0
11 /vsd ext4 /dev/block/mmcblk0p11 (null) 0
12 /sdcard vfat /dev/block/mmcblk1p1 /dev/block/mmcblk1 0
13 /boot emmc boot (null) 0
14 /recovery emmc recovery (null) 0
15 /system ext4 system (null) 0
Command: "/sbin/recovery"
ro.secure=1
ro.allow.mock.location=0
ro.debuggable=0
persist.service.adb.enable=1
ro.build.id=THMAS0042
ro.build.display.id=THMAS0042
ro.build.version.incremental=0042.001
ro.build.version.sdk=13
ro.build.version.codename=REL
ro.build.version.release=3.2.1
ro.build.date=Thu Dec 1 01:45:02 JST 2011
ro.build.date.utc=1322671502
ro.build.type=user
ro.build.user=integ-build
ro.build.host=build5
ro.build.tags=test-keys
ro.product.model=Sony Tablet S
ro.product.brand=Sony
ro.product.name=nbx03_001
ro.product.device=nbx03
ro.product.board=nbx03
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=Sony
ro.product.locale.language=en
ro.product.locale.region=US
ro.wifi.channels=
ro.board.platform=tegra
ro.build.product=nbx03
ro.build.description=nbx03_001-user 3.2.1 THMAS0042 0042.001 test-keys
ro.build.fingerprint=Sony/nbx03_001/nbx03:3.2.1/THMAS0042/0042.001:user/test-keys
ro.build.characteristics=tablet,nosdcard
ro.opengles.version=131072
wifi.interface=wlan0
ro.ethernet.interface=eth0
ro.ethernet.autoEnable=yes
rild.libargs=-d /dev/ttyACM1 -i rmnet0
ro.sony.sound.enabled=true
ro.separated.external.storage=true
ro.external.storage.removable=false
ro.tether.denied=true
windowsmgr.max_events_per_sec=120
ro.sony.display.release=release2
ro.setupwizard.mode=DISABLED
ro.com.google.gmsversion=3.2_r4
ro.config.notification_sound=OnTheHunt.ogg
ro.config.alarm_alert=Alarm_Classic.ogg
ro.com.google.clientidbase=android-sony
ro.sony.wifisleep=0
dalvik.vm.heapstartsize=5m
dalvik.vm.heapgrowthlimit=48m
dalvik.vm.heapsize=256m
ro.sony.update.server=info.update.sony.net
ro.sony.update.category_id=ST001
ro.sony.update.service_id=nbx03_001
ro.sony.sku.base=nbx03_001
ro.sony.build.id=THMAS0012400
ro.sony.build.incremental=111201009
dalvik.vm.dexopt-flags=m=y
net.bt.name=Android
net.change=net.bt.name
dalvik.vm.stack-trace-file=/data/anr/traces.txt
ro.sony.wan.ipv6.enable=false
ro.sony.stayawake.hidden=false
ro.sony.wan.fixed_apns=0
ro.factorytest=0
ro.bootmode=unknown
ro.baseband=unknown
ro.carrier=wifi-only
ro.bootloader=0x00000008
ro.hardware=nbx03
ro.revision=0
init.svc.recovery=running
init.svc.nfx_daemon=running
init.svc.adbd=running
-- Install /sdcard ...
Finding update package...
I:Update location: /sdcard/signed-nbx03_001-ota-0042.001.zip
Desklunvr update package...
Opening update package...
I:1 key(s) loaded from /res/keys
Verifying update package...
I:comment is 1465 bytes; signature 1447 bytes from end
I:whole-file signature verified against key 0
I:verify_file returned 0
Checking version is passed, 111104048 -> 111201009
minzip: file is empty
minzip: Map of '/configs/region.zip' failed
Fail to open /configs/region.zip
E
rohibit update as a result of checking version or base sku
Installation aborted.
Starting recovery on Mon Apr 30 22:05:33 2012
framebuffer: fd 4 (1280 x 800)
recovery filesystem table
=========================
0 /tmp ramdisk (null) (null) 0
1 /configs ext2 /dev/block/mmcblk0p1 (null) 0
2 /system0 ext4 /dev/block/mmcblk0p2 (null) 0
3 /system1 ext4 /dev/block/mmcblk0p3 (null) 0
4 /cache ext4 /dev/block/mmcblk0p4 (null) 0
5 /misc emmc /dev/block/mmcblk0p5 (null) 0
6 /staging ext4 /dev/block/mmcblk0p6 (null) 0
7 /blflags ext4 /dev/block/mmcblk0p7 (null) 0
8 /datapp ext4 /dev/block/mmcblk0p8 (null) 0
9 /log ext4 /dev/block/mmcblk0p9 (null) 0
10 /data ext4 /dev/block/mmcblk0p10 (null) 0
11 /vsd ext4 /dev/block/mmcblk0p11 (null) 0
12 /sdcard vfat /dev/block/mmcblk1p1 /dev/block/mmcblk1 0
13 /boot emmc boot (null) 0
14 /recovery emmc recovery (null) 0
15 /system ext4 system (null) 0
Command: "/sbin/recovery"
ro.secure=1
ro.allow.mock.location=0
ro.debuggable=0
persist.service.adb.enable=1
ro.build.id=THMAS0042
ro.build.display.id=THMAS0042
ro.build.version.incremental=0042.001
ro.build.version.sdk=13
ro.build.version.codename=REL
ro.build.version.release=3.2.1
ro.build.date=Thu Dec 1 01:45:02 JST 2011
ro.build.date.utc=1322671502
ro.build.type=user
ro.build.user=integ-build
ro.build.host=build5
ro.build.tags=test-keys
ro.product.model=Sony Tablet S
ro.product.brand=Sony
ro.product.name=nbx03_001
ro.product.device=nbx03
ro.product.board=nbx03
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=Sony
ro.product.locale.language=en
ro.product.locale.region=US
ro.wifi.channels=
ro.board.platform=tegra
ro.build.product=nbx03
ro.build.description=nbx03_001-user 3.2.1 THMAS0042 0042.001 test-keys
ro.build.fingerprint=Sony/nbx03_001/nbx03:3.2.1/THMAS0042/0042.001:user/test-keys
ro.build.characteristics=tablet,nosdcard
ro.opengles.version=131072
wifi.interface=wlan0
ro.ethernet.interface=eth0
ro.ethernet.autoEnable=yes
rild.libargs=-d /dev/ttyACM1 -i rmnet0
ro.sony.sound.enabled=true
ro.separated.external.storage=true
ro.external.storage.removable=false
ro.tether.denied=true
windowsmgr.max_events_per_sec=120
ro.sony.display.release=release2
ro.setupwizard.mode=DISABLED
ro.com.google.gmsversion=3.2_r4
ro.config.notification_sound=OnTheHunt.ogg
ro.config.alarm_alert=Alarm_Classic.ogg
ro.com.google.clientidbase=android-sony
ro.sony.wifisleep=0
dalvik.vm.heapstartsize=5m
dalvik.vm.heapgrowthlimit=48m
dalvik.vm.heapsize=256m
ro.sony.update.server=info.update.sony.net
ro.sony.update.category_id=ST001
ro.sony.update.service_id=nbx03_001
ro.sony.sku.base=nbx03_001
ro.sony.build.id=THMAS0012400
ro.sony.build.incremental=111201009
dalvik.vm.dexopt-flags=m=y
net.bt.name=Android
net.change=net.bt.name
dalvik.vm.stack-trace-file=/data/anr/traces.txt
ro.sony.wan.ipv6.enable=false
ro.sony.stayawake.hidden=false
ro.sony.wan.fixed_apns=0
ro.factorytest=0
ro.bootmode=unknown
ro.baseband=unknown
ro.carrier=wifi-only
ro.bootloader=0x00000008
ro.hardware=nbx03
ro.revision=0
init.svc.recovery=running
init.svc.nfx_daemon=running
init.svc.adbd=running
-- Install /sdcard ...
Finding update package...
I:Update location: /sdcard/signed-nbx03_001-ota-0042.001.zip
Desklunvr update package...
Opening update package...
I:1 key(s) loaded from /res/keys
Verifying update package...
I:comment is 1465 bytes; signature 1447 bytes from end
I:whole-file signature verified against key 0
I:verify_file returned 0
Checking version is passed, 111104048 -> 111201009
minzip: file is empty
minzip: Map of '/configs/region.zip' failed
Fail to open /configs/region.zip
E
rohibit update as a result of checking version or base sku
Installation aborted.