As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 1606 - DIV - TO YUL - DUE TO CREW O2 DOWN TO 20PSI. CORRECTIVE ACTION: SERVICED OXYGEN BOTTLE, FOUND PRESSURE DROP SLIGHTLY AFTER 8 HOURS, SWAPPED CAPTAIN'S OXYGEN MASK AND DEFERRED PER MEL 25-11-02D-ATL REPLACED LEFT OBSERVER'S OXYGEN SUPPLY LINE AND CAPTAIN'S OXYGEN MASK. LP 6378074