Here's my closeout (hopefully)..
I bought a used amp on eBay. The seller described the amp as remanufactured but when it arrived, there was no factory remanufactured sticker. I did order the p/n that ended in 01, not 0 so hopefully it will be OK (the supposedly upgraded part).
Installation went well. I had some trouble with a round plastic fastener at the far front of the side panel (the piece with the pocket) and this makes access more difficult than it should be. Oddly, this particular fastener had a sticky rubber coating which made re-installation much easier. It sticks to your finger when you go to replace it. Be sure to use this exact fastener in this particular place when you put everything back together.
All-in, it took me a little longer than an hour. It would have been faster had I done the procedure before. The replacement amp seems to be working fine and the sound is back. When I had finished, I opened up my old amp to see if there was an obvious problem. Although one part of the board was discolored, there was nothing else obviously wrong.
I thought I'd be helpful and provide photographs for those that follow in my footsteps. Some of the photos have notes.
http://www.flickr.com/photos/oparvez/sets/72157617363721873/
I hope this helps others...