I'm new to this forum and saw some people request for WebOS Doctor after running into similar problem. Just few minutes ago, I too was desperately looking for WebOS Doctor 3.0.0 but nobody had it (not even Google) and the palm cdnetworks links are down. While downloading WebOS Doctor 3.0.5, I found the links and tried the older version to see if they had it in their server as well. Results? download links below!
Download Link (HP Touchpad Wifi Only)
WebOS Doctor 3.0.0 (FULL)
WebOS Doctor 3.0.2 (FULL)
P.S- I'd advise you to save the files and back them up just in case.