I just repaired this stereo FR channel, still saying "DC protect 255H" I measure about -9 volts to ground on all emitters, collectors of the mains, on all the big emitter resistor pins. I have checked all the channels, everything looks fine, no bad components in the channels, seems to be back feeding from the DC protect line. Its on every channel too. I pulled all the main outputs and still have the voltage. Im stumped, I have spent too many hours chasing this ghost.