Marantz PM6005 - Needs Repair (Protection Mode)

I am selling my Marantz PM6005. The unit is in excellent condition and sounds fantastic, but it enters protection mode when driving speakers. It remains perfectly functional for headphone use or as a standalone DAC/preamp. The Details: Performance: Perfectly functional for headphone listening and as a digital-to-analog converter. Condition: Well-maintained; I have already cleaned the volume potentiometer for smooth operation. The Issue: The unit triggers protection mode only when connected to speakers, indicating a fault in the power amplifier stage. Ideal for a DIY enthusiast or technician. 100$ or best offer