TC reported smoke external at rear M2 car. Staff(QUE) checked and confirmed no signs of smoke. Rear train T317 did line clear confirmed no signs of smoke along trackside. ~~~~~ FAULT REOCCURED AFTER 1HR RESET. C/O SMOKE DETECTOR DUE TO WATER INGRESS. FUNCTION CHECKED, RESET OK. MONITORED FOR 1HR, OK. ALSO CHECKED #1545 DAMPER, ACTIVATE FIRE EXTER L/INTER L, OK.ALBARADO/SHAHRIE,29/09/20