TC reported smoke external at Front M1 car. Rear T261 line clear to BSH NB, no abnormalities. Staff( AMK) checked, Front M1 car no abnormalities. ~~~~~ TC reported smoke external at 1547 car. Rear T261 line clear to  BSH NB, no abnormalities. Staff(AMK) checked, Front M1 car no abnormalities. CE: T223-1547 Smoke External Alarm Reset.Fault Cleared  1547 fault code 721 on 04/08/23, check smoke detector unit no sign of water ingress. Preventive change out smoke detector unit and function test ok. 1547 #2 smoke detector notif csc:11745041 Done by Asruddin/Haslan/Zulq 45155