What was found
THE CREW REPORTED A LAVATORY SMOKE WARNING ON DEPARTURE. THE INDICATION REMAINED ON FOR 8-9 MINUTES, COMPLIED WITH QRH, NO SMOKE PRESENT. THE ACFT LANDED WITHOUT INCIDENT. MX R & R THE F/A SMOKE DETECTOR CONTROL PANEL, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.