As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S OXYGEN HARNESS FAILS TO INFLATE (IS LEAKING). CAPT'S O2 MASK DOES NOT TEST PROPERLY. SWAPPED HARNESS AND BOX WITH 2ND OBSERVERS - 2ND OBSERVERS SEAT AND EQUIPMENT INOP. REPLACED MASK. MASK WORKS PROPERLY. BOX DOES NOT TEST AT ALL. REPLACED MASK, NO HELP. TURNED ON O2 CREW SUPPLY SWITCH ON OVERHEAD PANEL. O2 MASK AND BOX TESTED NORMAL.