I have had the motorboating problem mention in the service bulletin supplied by someone here.

What is the brown stuff at the base of the caps and around the transformer? It appears to have oozed from somewhere. In the photo called resist, check the flying resistor with the silicon blob above R42. Bad/burnt joint. And check the solder joints on the amp. Looks like it was done by hand, not automation. Very dirty.

Could the brown junk have come from the caps? Check other messages for pics.