TIMS showed Smoke External Alarm at car1515. Staff(AMK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Rear T 205 line clear and confirmed no abnormalities. ~~~~~ TIMS showed Smoke External Alarm at car   FC721 Smoke external fault. Found FSD dusty on PCB side and signs of previous water ingress. c/o and function tested ok. S/N:   Notification: 2512931 Done by: Jack/Koh/Rizman 45145