A total recap tends to be a good opportunity to:
1. introduce solder bridges
2. solder caps in backwards, especially so when markings on silkscreen are wrong and you're not paying attention to polarity upon unsoldering
So this is the original plain vanilla 3020, right? Then I would check C626. Its - end must go to R638, + to R636. No solder bridges, obviously.
Oh, and you may want to ask a mod to move this to Solid State, the trusty 3020 obviously isn't a chip amp.