As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VERIFIED NR O2 LEAK AT LT SIDE CAPTAIN'S. SECOND OBSERVER O2 MASKS CHANGED OUT FROM AC 4101 DOWN TO LT SIDE FLOOR LEVEL T-FITTING. CHANGED OUT CAPT'S AND SECOND OBSERVER'S STOWAGE BOX 5774HM, 10RN1 COPPER RING CONICAL WASHER. TIGHTENED AND LEAK CHECKED.