Rebuild a Counterpoint SA-100 or start over?

I have a Counterpoint SA-100 hybrid amp that's about 13 years old. Recently I had to press it into service on a backup system. The amp is running noisy (hissing and hash). I changed the tubes, but the problem is still there. Maybe it has to do with the mosfet outputs. Anyway, I could send the amp to Alta Vista Audio and have the thing rebuilt for about $1,000. The guy that runs Alta Vista also ran Counterpoint before its demise. Philisophically, I do have a bit of a problem sending the amp for a rebuilt when the guy didn't do such a great job in the first place. The alternative is to just buy a new amp. It would drive a pair of Quad 22Ls. Any suggestions?