As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FO OXY MASK DOES NOT TEST PROPERLY. M2: FIRST OBS SEAT INOP DUE TO OXYGEN MASK INOP. SWAPPED MASK WITH FIRST OBS POSITION IAW AMM 35-11-04, OPS CHECK OK. NOW FIRST OBS SEAT INOP DUE TO OXYGEN MASK INOP. REMOVED AND REPLACED FIRST OBSERVERS OXYGEN MASK STORAGE BOX PER AMM 35-11-51, OPS CHECK GOOD. THIS CLEARS MDDR 129580.