As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAINTENANCE DISCOVERED, DURING OXYGEN SERVICE THAT THE OXYGEN GAUGE LOCATED AT THE FILLER PORT HAD AN INTERNAL LEAK. REMOVED THE OXYGEN CONTENTS GAUGE AND INSTALLED NEW OXYGEN GAUGE. LEAK AND FUNCTIONAL CHECKS SATISFACTORY. REF: AMM 35-10-33.