As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY DOOR LOCKS AND WILL NOT UNLOCK, TRAPPED PASSENGER INSIDE LAVATORY, EITHER NORMAL OR ALTERNATE RELEASE PROCEDURES WORK. REMOVED AND REPLACED LAVATORY DOOR LOCK IAW EMB AMM 25-40-02. OPERATIONAL CHECK GOOD. RETURNED AIRCRAFT TO SERVICE.