As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE, ALL FOUR CREW OXYGEN POSITIONS ON EMPTY WITH ZERO FLOW IN FLIGHT. BOTTLE PRESSURE 1500 IN FLIGHT AND 1600 PSI ON GROUND. AIRCRAFT DIVERTED TO ENN. REMOVED AND REPLACED OXYGEN REGULATOR. PERFORMED OPERATIONAL CHECK PER M/M 35-10.