As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT PERFORMED AN UNSCHEDULED LANDING AT IAD DUE TO A LEAK ON CREW OXYGEN SYS. MX PERFORMED AN OXYGEN CREW INSPECTION IAW MM 35-12-85, DETECTING OXYGEN LEAK IN THE BOTTLE & THE MANOMETER WAS INDICATED 320 PSI. THE OXYGEN BOTTLE WAS REPLACED IAW AMM DMC-B787-A-12-15-08-00B-200A-A, TESTED CORRECT.