What was found
CREW REPORT: CAPTS O2 MASK WON'T TEST, CAN'T TRANSMIT ON INT HAND MIC CHECKS OK ON INT. SWAPPED WITH 2ED OBS SEAT AND NOW CAPT WORKS NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
CREW REPORT: CAPTS O2 MASK WON'T TEST, CAN'T TRANSMIT ON INT HAND MIC CHECKS OK ON INT. SWAPPED WITH 2ED OBS SEAT AND NOW CAPT WORKS NORMAL.