Originally had blown outputs on right channel. Someone had already repaired or attempted a repair at one time judging from broken traces and pads on the 2981 board. I replaced output transistors on both channels, all emitter resistors, driver transistors, all VR's with Bourns units and almost all caps on the F-2980 board. (after removing tons of dried glue!) Still have low output and distortion on the right channel. Left channel sounds great. I can adjust DC offset and bias on the left channel, but when putting the meter across R-channel emitters per manual I get 0v and adjusting VR04 does nothing. I'm perplexed that I have sound but no voltage across those emitters.