As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY ONE HOUR INTO CRUISE FLIGHT COCKPIT OXYGEN BOTTLE STARTED LEAKING. DESCENDED TO FLIGHT LEVEL 250 AND SHUT OXYGEN VALVE PER MAINTENANCE CONTROL. LEAK CONTINUED UNTIL APPROXIMATELY 5000 FEET. ON CALL MAINTENANCE REMOVED AND REPLACED THE OXYGEN DISCHARGE LINE IAW MM 35-10-01. NO LEAKS NOTED. AIRCRAFT RETURNED TO SERVICE.