Yes, I've done most of that. Already replaced all 2SA726, 2SC1451 (power amp boards and control board). Replaced all transistors on power supply. Replaced all e-caps on power supply, power amp, protection boards. Since this receiver does not have pre-in/power-out separation, I've checked power amp output on each channel with input from control amp grounded. Does not seem to make a difference, so static issue seems to be on power amp. Here's the current situation. I can get the channels on the B board down into the right range (0V) using the trimmers (though it is still too variable), but not the A board channels, AND the A board channels are stuck in negative voltage. Voltages at each pin: 5B (rear right): 0.001±0.01 23B (front left): 0.0007±0.009 5A (rear left): -0.066±0.02 23A (front right): -0.05±0.1 Protection seems to be working, as it will click in and out if voltages on the channels get too high. What's left on the power amp are Q5 & 6: 2SC869, and Q9-12. Have replacements for all of those, so that is likely the next step. I'm not expecting this is an issue with Q13-16, at least I hope it isn't.