As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/O O2 MASK INOP RED INFLATE BROKEN. SWAPPED F/O MASK FOR FIRST OBSEVERS MASK. FIRST OBSERVERS SEAT NOT TO BE OCCUPIED. BROKEN MASK INSTALLED IN OXYGEN COMPARTMENT BUT NOT HOOKED UP DUE TO MASK LEAKING. REPLACED O2 MASK AT FIRST OBSERVER POSITION PER AMM. LEAK CHECK GOOD.