TIMS showed Smoke External Alarm at car3570. Staff(BDK) checked and confirmed no signs of heat or s moke smell on exterior or interior of train. Rear T122 line clear and confirmed no abnormalities. ~~~~~ FC 721 FAULT U BLE TO DUPLICATE.C/O 3570 SMOKE SENSOR DONE.FUNCTION TEST OK.SECURITY CHECKED OK. JIMMY/TEH/RAGHU/GANESAN 20.04.2023 (TWD) 3570 EXTER L SMOKE SENSOR NOTIFICATION 2481537