I'll go out on a limb here and say if it was an output transistor blown, it'd probably stay blown and take a fuse or other transistors with it.
I don't have a schematic in front of me and it doesn't sound like you do either. But if you want to poke around, I suggest getting one from one of the many websites that pedal them. Then I'd go looking at the base-emitter junctions of the offending channels driver transistors with no load hooked up to the amp. You wanna see 0.7 volts at the junction. Compare voltages with the good channel to confirm.
That's the best I can do for you "blind".
I don't have a schematic in front of me and it doesn't sound like you do either. But if you want to poke around, I suggest getting one from one of the many websites that pedal them. Then I'd go looking at the base-emitter junctions of the offending channels driver transistors with no load hooked up to the amp. You wanna see 0.7 volts at the junction. Compare voltages with the good channel to confirm.
That's the best I can do for you "blind".
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