As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED INTERMITTENT LAVATORY SMOKE ON EICAS WITH NO SMOKE OR ANY FIRE NOTED IN LAVATORY BY F/A. MX CLEANED THE LAVATORY SMOKE SENSOR AND R & R THE SMOKE DETECTOR PANEL, OPS CHECKED SUCCESSFUL. ACFT WAS APPROVED FOR RETURN TO SERVICE.