As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE AFT LAVATORY MASTER CAUTION WARNING IN FLIGHT. FLIGHT ATTENDANT REPORTS NO SIGN OF SMOKE. PERFORMED FIM TASK IAW FIM 26-16-00. FOUND NO DISCREPANCIES. PERFORMED OPERATIONS CHECKS ON AFT LAVATORY SMOKE DETECTION SYS IAW AMM 26-16-00. OPERATIONS CHECKED GOOD.