PG reacts to distotion at the outputs, lowering the input signal level.
If BOTH PG lights are lit the amp is reacting to some major distortion issues, most likely a catastrophic failure in the power supply which is one the few parts of the amp common to both channels.
Disconnect your speakers and get it into your local repair shop. Do not put your speakers at risk or possibly cause additional internal amp issues by turning it on and off in non controlled conditions.
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