As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT VHF COMMS AUDIO RECEPTION POOR AT 1 POSTITION. RECEPTION OK AT OTHER CREW POSITIONS. (01=CAPT POS'N, 02=1ST OFF POS'N, 03=OBS POS'N). CAPT'S SIDE TONE INEXPLICABLY INTERMITTENT ON VHF 1. REPLACED CAPT AUDIO CONTROL PANEL. CHECKED OKAY.