As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT CAN TRANSMIT BUT NOT RECEIVE AUDIO THROUGH ALL COMM SYSTEMS. AFTER TRANSFER TO GROUND POWER, AUDIO SYSTEM BEGAN FUNCTIONING. HOWEVER, COMMS WERE STUCK W/ SPEAKER ENABLED EVEN WHEN DESELECTED. NO EMERGENCY WAS DECLARED. REMOVED AND REPLACED MRC1 NIM1 IAW AMM 34-02-04. OPS LOAD COMPLETE, NO FURTHER DEFECTS NOTED AT THIS TIME. OPS CHECK GOOD.