As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CREW RECEIVED A LAVATORY SMOKE CDS MESSAGE. AIRCRAFT RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT. MECHANIC ON BOARD FLIGHT REPORTED NO SMOKE IN LAVATORY OR ANY UNUSUAL ORDERS. MAINTENANCE TROUBLESHOT AND FOUND THE LAVATORY SMOKE PANEL AT FAULT. REMOVED AND REPLACED THE PANEL. AIRCRAFT RETURNED TO SERVICE.