As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S OXYGEN HARNESS FAILS TO INFLATE (LEAKING). HARNESS ATTACH POINT PIN MISSING SWAPPED WITH SECOND OBSERVERS MASK. CAPT'S O2 MASK CHECKED NORMAL. INOPED SECOND OBSERVER SEAT. REPLACED SECOND OBSERVERS MASK PER AMM. OPS CHECKED NORMAL.