TIMS showed Smoke External at rear M2 car.Staff (AMK) checked and feedback no abnormalities.Rea r T430did line clear also confirmed no sign of smoke alongthe way between BDL1 and BSH1.SM(BDL) took cab ride confi ~~~~~ TIMS showed Smoke External at rear M2 ca     #2538 FC 721 X 1 (21/3/23) Check smoke detector no sign of water ingress.Preventive replace smoke detector function test ok.Check all car plaseal.Install and add more plaseal for each car. Smoke detector: Not: 2472995 raise to CSC. Done by Saini/Zulq/Asruddin. 23/03/23