As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT A. FA CALLED TO NOTIFY CREW THAT AFT SMOKE DETECTOR WAS SOUNDING OFF WITH NO OTHER INDICTAIONS AT ALL. / RESET SMOKE ALARM GREEN LIGHT SHOWS GOOD. PERFORMED AFT LAV SMOKE DETECTOR SELF TEST. TEST PASSED. REF AMM 26-14-00. INSPECTED LAV. NO DEFECTS NOTED. FIRE BOTTLE UNDER SINK WAS NOT DISTURBED. HEAT INDICATOR STRIP IS STIL GOOD. NO DEBRIS IN LAV WASTE CONTAINER