As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: MID LAVATORY DOOR LOCK STICKS RESULTING IN PASSENGER NEEDING FLIGHT ATTENDANT ASSISTANCE TO UNLOCK THE DOOR. MAINTENANCE CLEANED AND LUBRICATED MID LAVATORY BI FOLD DOOR PER AMM 25-40-00. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.