TIMS showed Smoke External Alarm at car1569. Staff(AMK) checked and confirmed no signs of smoke or fire on exterior of train. Rear T262 line clear and confirme d no abnormalities. TIMS showed Smoke External Alarm at car ~~~~~ TIMS showed Smoke External Alarm at car 1569   Found #1569 smoke external alarm triggered. Rplaced new external FSD with gland and plaseal. Function tested satis. S/N: Nil Notification to CSC: 2550875 Done by Kamal and Firas. 12/12/2023.