As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7786 LAX FLIGHT CREW REPORTED LAV SMOKE INDICATION AND PERFORMED AN AIR RETURN. MX PERSONNEL PERFORMED HIGH POWER RUNS AND COULD NOT DUPLICATE LAV SMOKE INDICATION MSG. OPS CHECK SATISFACTORY AND AIRCRAFT WAS RELEASED TO RETURN FOR SERVICE.