TIMS showed Smoke External Alarm at car3564. Staff(AMK) checked and confirmed no signs of smoke / f ire / burning smell on exterior or interior of train. Rear T 207 line clear and confirmed no abnormalities. TIMS showed S ~~~~~ TIMS showed Smoke External Alarm at car 3564. Staff(AMK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Rear T207 line clear and confirmed no abnormalities. CE: T419(3564) check n found car having smoke external  pre-alarm faults (sdR11) lit. No abnormality was found  n reset fault cleared  3564 FC 735 @ 721. Replaced Ext smoke detector and tested ok. Notif 2575079 Done by Sanip/Koh/Rizman 28.02.2024