As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL PASSENGER OXYGEN MASKS DEPLOYED WHEN CREW TURNED ON OXYGEN. REPLACED REGULATOR (P/N 900-002-007-6), (S/N 425). SUSEQUENTLY REPACKED MASKS AND PERFORMED OXYGEN MASK DROP AND ALL EXCEPT PASSENGER SEAT ROW 24DEF SUCESSFULLY DEPLOYED. REPLACED PASSENGER OXYGEN MANIFOLD (P/N 115039-11), (SN 11578) AND REPACKED OXYGEN MASKS, OPS CHECKED GOOD IAW MM 35-00.