As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: SEAT 20ABC O2 MASK COMPARTMENT WILL NOT RELEASE WHILE PERFORMING THE DROP TEST IAW AMM 35-23-00. MAINTENANCE OPENED AND INSPECTED MASK CONTAINER AT 20ABC. REPACKED AND STOWED MASKS AS NEEDED, PER AMM 35-21-43 AND PERFORMED SATISFACTORY DROP TEST IAW AMM 35-23-00.