The other day my M-80 went into protection mode and wouldn't come out, so I opened it up and checked it out. I did replace one transistor that seemed to have something to do with the protection. Now when I turn it on the protection doesn't come on at all, and there is no sound from the speakers either. When I hit the buttons for the speakers (A, B, or C) you can hear the relay switching and the speaker pops. I was wondering if anyone either knows how to fix this, or if anyone has a schematic for this thing. Any help would be greatly appreciated. Thank you