As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING EMERGENCY DESCENT AFTER MANUAL DEPLOYMENT OF OXYGEN MASKS, SEVERAL MASKS FAILED TO DEPLOY. FLIGHT ATTENDANT MANUALLY DEPLOYED MASKS AT SEAT ROW 2, 4 & 12 AND LAVATORIES A & C. MAINTENANCE REPLACED SOLENOIDS (ACTUATORS) AT SEAT ROWS 2, 4 & 12 AND LAVATORIES A & C; PERFORMED OXYGEN MASK DEPLOYMENT TEST IAW BMM 35-21-00 PG 501 AND T/C F1C35601.