As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO DFW DUE TO THE FLIGHT CREW REPORTING THAT THE FLIGHT DECK OXYGEN PSI WAS 440 WITH A TEMPERATURE OF 54. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT, MAINTENANCE REPLACED THE FLIGHT CREW O2 BOTTLE AND ACCOMPLISHED A SATISFACTORY LEAK / OPERASTIONAL CHECK PER AMM 35-11-41.