As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OXYGEN SYSTEM LEAK. FOUND THE LEAK ON THE COPILOT'S MASK. THE FLOW INDICATOR HAS A CLEAR PLASTIC PIECE TO VIEW OXYGEN FLOW. THIS IS THE 2ND MASK FOUND IN THE PAST 2 YEARS WITH THE SAME LEAK. THERE IS A 120-DAY BACKORDER ON THIS MASK. THIS REQUIRES OPERATOR TO DISCONNECT THE MASK AFTER EACH FLIGHT.