G-K 700RB Power Amp Debug

[Jeema]

I was actually trying to think just now how it is that all 3 transistors could fail on one side and none on the other side.

Someone correct me if I'm wrong, but if the negative feedback is working correctly, then wouldn't at least one of the power transistors on the opposite side fail in pretty short order too?

Maybe there's an issue with oscillation or the negative feedback is not working properly. I don't know. Are R8-R10 okay?

[telecaster]

R8 and R10 measure correctly (1K and 43.2K). I don't find R9 on the board or schematic.

In the past, I replaced all outputs on both sides when repairing an amp, this is the first time I just replaced the failed devices. Maybe that was penny-wise and pound foolish, because I have more invested in time spent than the parts would have cost.

[telecaster]

Any further suggestions for help ?
Should I replace the rest of the outputs that weren't (and aren't) shorted?