As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA INFLIGHT T970/19SEP FLIGHT ATTENDANT REPORTED SMOKE IN CABIN. LAVATORY Y SMOKE ALARM CHIME ALERTED FLIGHT ATTENDANT WITH INDICATION ON PURSER PANEL. LANDED MIA WITHOUT INCIDENT. DETERMINED IT WAS A FALSE ALARM. REPLACED SMOKE DETECTOR ASSEMBLY AT LAVATORY Y. SYSTEM GROUND CHECKED NORMAL OPERATION.