As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE OXYGEN CYLINDER VALVE WAS FOUND TO HAVE A GROOVE AT THE REGULATOR CONNECTION CAUSING AN OXYGEN LEAK. MAINTENANCE REPLACED THE OXYGEN CYLINDER/VALVE ASSEMBLY WITH A SERVICEABLE UNIT. THE LAST HYDROSTATIC INSPECTION/OVERHAUL OF THE DEFECTIVE UNIT WAS PERFORMED ON 5/13/2019. THE NEXT OVERHAUL DUE IS 5/13/2022