As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW O2 LEAK. FLIGHT DIVERTED. O2 WAS SERVICED TO 1800 PSI IN SFO PRIOR TO ORIGINAL DEPARTURE, AT GATE CREW O2 READING 1280 PSI PER ORDMM. REVIEW AMIS HISTORY PRIOR TO WORKING. FOUND FILL PORT REGULATOR & FILL LINE CHECK VALVE LEAKING RESEATED AND CHECKED ALL FLIGHT DECK O2 MASK AND CONNECTIONS OKAY. SERVICED O2 SYSTEM HELD FOR OVER 1HR WITH NO LOSS OF PRESSURE.