TIMS showed Smoke Internal at rear M1 car. Staff(AMK) checked and confirmed no signs of smoke / fire/ burning smell on exterior or interior of train. TIMS show ed Smoke Internal at the rear M1 car. Staff(AMK) checked and ~~~~~ TIMS showed Smoke Internal at rear M1 ca #1508-Check smoke detector unit PCB no sign of water ingress. Use Air compress blow and replace smoke detector.Function check ok. #1508-smoke detector:- Not: 2490715 raise. Done by Asruddin/Saini/Haslan.  21/05/23