TIMS showed Smoke External Alarm at rearM2 car. Staff(AMK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Rea r T218 line clear and confirmed no abnormalities. ~~~~~ 3614 - TIMS showed Smoke External Alarm at rear  M2 car. Staff(AMK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Rear T218 line clear and confirmed no abnormalities.  Replaced #2613 smoke external FSD and function tested satis. Notification to CSC: 2534899. Done by Pravin, Samsudin. 22/10/2023/