I am trying to repair a set of amps that were hurt during lighting. One of them seems like it will be ok. The other, a GFA555II, powers up, but the thermal protection light stays on constantly, and no sound is coming from either channel. I have replaced all external fuses, there are no fuses inside to replace, like the older GFA555 (with no thermal protection circuit). Anybody know where this circuit is? There is a little blue wire with a plug on the end coming out of the toroidial transformer area...is this where they plug in something to reset the circuit?