I flashed back to stock and upgraded to KK. The button problem sorta went away; acts funny in some apps to where home or menu won't respond and takes a few taps for back button to register. I found the correct way to access the hidden menu for the sprint variant and screen test is showing a dead area when doing the drawing test:
The Secret code to access hidden menu on LG G Flex LS995 is different.
Dial 5689#*995# , You will access the hidden menu on G Flex.
How to Troubleshoot Problems Using the hidden menu on LG G Flex (LS995).
1. Dialer 5689#*995# ->
2. Select Device Test ->
3. Press Power Button & Select AATFULL(+power key) ->
4. Select All Auto Test – Full.
"If you could walk a mile in my shoes, you would be crazy too.....with nothin' to lose" -2Pac