TIMS showed Smoke External at FM1 car.Staff (AMK) checked and feedback no abnormalities.Rear T4 43did line clear also confirmed no sign of smoke along theway between BSH1 and AMK1. ~~~~~ TIMS showed Smoke External at FM1 car.     Check all car no fault code smoke fire related.Check #1626 smoke detector no sign of water ingress or corrosion at terminal and    PCB.Check all car plaseal already install.For preventive safety replace #1626 smoke detector unit.Swap #2626/#1626 fire control panel.Function test both car smoke test ok.Monitor during shunting and stable ok.No fault. #1626 Smoke detector:- Not:2472795 raise. Done by Zulq/Saini/Syhami/Haslan. 22/03/23