Have you checked for blown fuse(s)?
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I found a fuse on the board of the amp, which I checked visually and it looked fine. I thought I should probably test it but haven't done so yet. The fuse at the power plug should be fine since the amp powers up just fine. Any other fuses I should look for? It always makes me nervous to poke around inside of these things since I don't know what I'm doing.
I don't know what part of the country you're in, but I had to have a Primare SP 31 processor-preamp rebuilt. I sent it to Randy Vikan at Audio Elite in Western Washington state. He's also a factory authorized tech for McIntosh. He does a good job, and doesn't charge outrageous prices.
Hope things works out for you.
Switch to vintage receivers and integrated amps:
Sansui G9000, Pioneer SX 1980...1280...1080,
These units have schematics accessible for free and are serviceable if break.
Modern high end stuff isn't or at least it would be more than arm/leg to ship around for dealer or manufacturer repair.