As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAINS CREW OXYGEN MASK HARNESS IS SPLIT, CAUSING OXYGEN LEAKAGE WHEN THE HARNESS IS INFLATED RAISING AND UPDATING SDR ORIGINAL CAPT OXYGEN MASK SWAPPED WITH SECOND OBSERVER OXYGEN MASK IAW AMM 35-11-51-004-059 AND 35-11-51-404-060. CAPT & SECOND OBSERVER OXYGEN MASK PUT BACK IN THE STOWAGE BOX WRT AMM 35-11-51-402-034.