As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW NOTED PRIOR TO THE AIRCRAFT GOING IN FOR INSPECTION THAT THE OXYGEN SYSTEM HAD A LEAK. THE MAINTENANCE VENDOR DISCOVERED THAT THERE WAS A LEAK FROM AROUND WHERE THE REGULATOR SCREWED INTO THE BOTTLE. THE BOTTLE WAS REMOVED AND DISPATCHED FOR REPAIR. THE BOTTLE AND REGULATOR WERE REINSTALLED AFTER REPAIR, NO LEAKS WERE NOTED.