As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED OF FLIGHT DUE TO DURING CLIMB, THE CREW OXYGEN CYLINDER WAS LEAKING WITH STRONG NOISE AND OXYGEN LOW LIGHT TURNED ON. MAINTENANCE PERSONNEL PERFORMED AN OXYGEN CREW INSPECTION IAW MM 35-12-85, DETECTING OXYGEN CYLINDER MANOMETER WITH 0 PSI AND THE SUPPLY HOSE BROKEN; THE CREW OXYGEN CYLINDER AND REGULATOR, TRANSDUCER AND COUPLING ASSEMBLY WERE REPLACED IAW AMM 35-12-85 AND OPERATIONAL TEST WAS PERFORMED IAW AMM 35-12-00, TESTED CORRECT.