Help, my old reliable equipment seems to be breaking down. I've lost my right channel. Through process of elimination, it seems not to be the speaker, cable, or Adcom GTP-350 pre-amp but rather my Adcom GFA-535 amp. Whenever I play a CD or an FM station, I only get sound out of the right side, and whenever I shut down, the "high current power amplifier instantaneous distortion alert" light comes on (on my amp). I've played with switching the speaker cables from A to B, but that didn't help. I tried unhooking the pre-amp and running the CD player just hooked up to the amp (as I used to do in my pre pre-amp days), but the right side was still out entirely (no static, no popping, nothing). As you can tell, I'm at a loss at what to do next except buy a new amp or get this one repaired. I'm wondering, though, have I missed any crucial steps/connections/possible solutions? I'd be grateful for your help, if you can give any.