As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT LOSS OF O2 (CREW) LANDED WITH 375 PSI. SERVICED. MX FOUND CAPT O2 MASK LEAKING. SWAPPED TO FIRST OBSERVER SEAT. REMOVED, SERVICED AND REINSTALLED CREW O2 BOTTLE. LEAK CHECK CARRIED OUT. NO FAULTS, ACFT OK FOR CONTINUED SERVICE. CAPTAIN'S MASK REMOVED AND REPLACED.