TIMS showed Smoke External Alarm at car1526. Staff(YCK) checked and confirmed no signs of smoke / f ire / burning smell on exterior or interior of train. Rear T 441 line clear and confirmed no abnormalities. ~~~~~ 1526 TIMS showed Smoke External Alarm. Staff(YCK) confirmed no signs of smoke/fire/burning smell on exterior or interior of train. Rear T441 line clear and confirmed no abnormalities.  1526 found FC 721 on 23/04/2023 & 27/04/2023. Fault was resettable. Cleaned up smoke detector & no water ingress was found. Monitor for 3 hours - OK.  Irwan Masop/Au TK 45044