TIMS showed Smoke External Alarm at car3534. Staff(AMK) checked and confirmed no signs of smoke ext erior of train. Rear T421 line clear and confirmed no abnorm alities. ~~~~~ TIMS showed Smoke External Alarm at car Check and found exteral FSD sensor very dirty,c/o FSD and function test ok.SDR11 install done. #3534 external FSD:- Not: 2494239 Done by Sanip/Rizman/Koh. 02/06/23