As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: JUST PRIOR TO TOP OF DESCENT, THE LAVATORY SMOKE LIGHT ILLUMINATED FOR APPROXIMATELY 5 SECONDS AND EXTINGUISHED WITH NO INDICATIONS OF A FIRE. MAINTENANCE ACCOMPLISHED LAVATORY SMOKE DETECTION TEST PER MM 26-14-00 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.