As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW OXYGEN LEAKS AT 10 PSI FOR EVERY 4 MINUTE INTERVAL. FOUND LEAKING FROM FITTING OF FO CREW O2 MASK STOWAGE BOX. REPLACED FO MASK AND BOX. NO LEAK NOTED AT STOWAGE BOX. BUT CREW O2 STILL LEAKING. FO CREW MASK ASSY, MR35112, ON 598, OFF 169. REPLACED O2 BOTTLE REGULATOR.