Hi, I have the same problem, I've just taken apart the amp, measured the SMD resistors from the amp selector board (the one with the rotary switch) and all read something, I also measured the legs of the rotary switch and I also get values, however I get weird readings from the three wires that go to the bigger board, can you tell me what values it should output when cycling to the various positions? That way I may just replace the whole board with a potentiometer of the appropriate value to make it work (without the clicks of course)
Thanks.
Thanks.