As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX, O2 MASK INADVERTENTLY DROPPED. REPACKED ALL MASKS IN CABIN & GALLEY IAW ACFT MM. PERFORMED DROP TEST OF MASKS IAW ACFT MM. DURING RESET OF PSU’S LATCHES 7 DEF & 9 DEF BROKE, WILL NOT STAY UP. PSU O2 MASKS AT 7/9DEF DEACTIVATED. R & R KEEPER LATCHES AT O2 CONTAINERS AT ROWS 7DEF + 9DEF IAW ACFT MM.