As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OXYGEN LOW PRESSURE CAUTION MESSAGE, 1410 PSI. LEAK CHECKED THE CREW OXYGEN SYSTEM AND FOUND THE LEFT PILOT OXYGEN MASK LEAKING. REMOVED AND REPLACED THE OXYGEN MASK IAW AMM 35-11-12. OPS CHECKED GOOD. OXYGEN PSI HOLDING AFTER 4 HOURS.