As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CA/FO/OBS O2 MASKS WHEN DONNED OXYGEN FLOW PULSES AND NOT CONTINUOUS. ALSO A DIRTY MUSTY SMELL FROM OXYGEN. ALL THIS OCCURS IN 100% AND EMERG POSITIONS. REPLACED REGULATOR REF AMM 35-12. REPLACED CREW O2 BOTTLE REF AMM 12-15. NO ODOR OR PULSATING FLOW ON CA/FO/OBS.