As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, CREW EMERGENCY O2 LEVEL FOUND DEPLETED TO 11 LBS. CREW O2 BOTTLE REPLACED ACC AMM12-15-08-603-001. P/N42365-1 S/N ON:R08-000164 S/N OFF:R14-000449. PERFORMED FURTHER T/S, FOUND F/O O2 MASK REPLACED IN MARCH BEFORE SEVERAL O2 SERVICES OCCURED. FO MASK REPLACED ACC AMM 35-11-51-404-060 REV 127. LEAK CHECK PERFORMED WITHOUT FINDINGS. AC RETURNED TO SERVICE.