As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT THE OXYGEN PRESSURE DROPPED 370PSI IN A LITTLE OVER AN HOUR. THE CREW OXYGEN INDICATOR WAS FOUND TO BE DEFECTIVE, THE O2 CAPILLARY LINE FROM THE INDICATOR WAS CAPPED AND OPERATIONS WERE CONTINUED PER MEL 35-11-00-2A. THE MAINTENANCE TEAM REPLACED THE CREW OXYGEN GAUGE WITH A NEW UNIT. OPS AND LEAK CHECKS WERE SATISFACTORY. THE AIRCRAFT WAS RETURNED TO SERVICE.