Hi, I am trying to fix a Yamaha AX-400 stereo amplifier in which the relay that powers the speakers won't turn on. The output transistors are good, B+ voltages are correct and the idle current for both channels are exactly what the service manual calls for. When I touch the collector to the emitter on Q135, the relay switches on and sound is normal on both speakers. I replaced both electrolytics in the protection circuit as they were a little low in capacitance, however this made no difference. Q135 is only getting 0.5v on the base, not 1.3v as per schematic. Anybody have any experience with these circuits?