As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ON SHORT FINAL SMOKE LAVATORY ENGINE INDICATING AND CREW ALERTING SYSTEM ALERT. INBOUND CREW REPORTED LAV3F-1R GAVE THE FAULT. PERFORMED TEST PER AMM 26-13-00-710-801. ALL TEST OK. NO SIGNS OF SMOKE IN TOILET.