TIMS showed Fire External Alarm at car 1551. Staff(AMK) checked and confirmed no signs of smoke, fir e or burning smell on exterior. Rear T440 line clear and con firmed no abnormalities. ~~~~~ TIMS showed Fire External Alarm at car 1551. Staff(AMK) checked and confirmed no signs of smoke, fire or burning smell on exterior. Rear T440 line clear and confirmed no abnormalities.#Train was scheduled to end service CE:1551 fire external alarm.Able to reset .No abnormality  Check the above mention fc735,721. Replaced external smoke detector done. Security check and function test ok. Smoke detector Notif:2548347 Done by Saini/Haslan 45264