As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: IN CRUISE, FORWARD LAVATORY SMOKE MESSAGE DISPLAYED AS WELL AS WARNING FOR 5 TO 10 SECONDS. FLIGHT ATTENDANT INSPECTED LAVATORY IMMEDIATELY AND FOUND NO EVIDENCE OF SMOKE. MAINTENANCE ACCOMPLISHED LAVATORY A SMOKE DETECTOR TEST PER AMM 26-17-00, NO FAULTS FOUND.