As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE AFT LAVATORY WARNING ON DESCENT. PULLED CB'S IAW EMER NON-NORMAL CHECKLIST. AFT SMOKE ALARM WAS ON BUT NO SMOKE. WARNING WENT OFF BEFORE LANDING. COMPLETED SMOKE FUMES SMOKE TOILET WORK SCOPE, NO DEFECTS FOUND. PERFORMED OPERATIONS TEST OF AFT LAVATORY SMOKE DETECTION SYS IAW AMM 26-16-00. OPERATIONS TESTED OK. OK FOR SERVICE.