As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S O2 MASK DOES NOT TRANSMIT OVER SPEAKER. SWAPPED CAPT AND F/O AUDIO CONTROL PANELS AND REPLACED AUDIO ASSY UNIT M108, ASSOCIATED CAPT AUDIO CHECKS OK. AUDIO CONTROL PANEL SWAP COVERED BY DF0750. ABOVE REF TO "F/O" IS SWAPPED WITH FIRST OBSERVERS POS.