As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - FLT 0095 - EN ROUTE DURING CRUISE, THE CREW OXYGEN DROPPED FROM 1100 PSI TO 960 PSI. DIVERTED TO LHR AND LANDED WITHOUT INCIDENT. TROUBLESHOT SYSTEM AND FOUND SEEPAGE FROM MAIN OXYGEN CONNECTOR. REPLACED OXYGEN BOTTLE AND RETORQUED ADAPTER. ACCOMPLISHED LEAK CHECK. SYSTEM GROUND CHECKED, NORMAL OPERATION.