An odd fault, no audio out as though in mute mode. The user manual says if in mute the volume knob LED flashes. What LED, nothing lit, just the power LED and function LEDs. The 2 thin wires that loop around the rotating pot motor shaft must have snagged somewhere and tugged enough to bend up the pcb connector socket and break a wire somewhere. If no LED load , the amp goes into protect/mute? the next time the amp is powered up, but caries on as normal until put in standby.