As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. SMOKE LIGHT ILLUMINATED FOR LEFT AFT LAVATORY LIGHT. WENT OUT IN ABOUT 5-7 SECONDS. FLIGHT ATTENDANT INVESTIGATED AND FOUND NO ODORS OR SECONDARY INDICATIONS. PERFORMED LAVATORY SMOKE TEST, PER AMM 26-14-00. NO FAULT FOUND.