As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: LAVATORY SMOKE DETECTOR LIGHT ILLUMINATED IN FLIGHT BRIEFLY THEN EXTINGUISHED. THERE WAS NO SMOKE IN ANY LAVATORIES AND NO SMOKE IN CABIN.ACCOMPLISHED A SATISFACTORY OPERATIONAL TEST OF EACH LAVATORY DETECTOR WITH NO FAULTS NOTED.