TIMS showed Smoke External Alarm at car3523. Staff(LKS) checked and confirmed no signs of smoke / f ire / burning smell on exterior of train. Rear T315 line cle ar and confirmed no abnormalities. TIMS showed Smoke Externa ~~~~~ CAR #3523 SMOKE EXTER L ALARM.CHECKED TIMS AND CONFIRMED SMOKE EXTER L ALARM FOUND WATER INGRESS.REPLACED EXTER L SMOKE DETECTOR.FUNCTION CHECKED OK.M HAIRUL/AKHBAR 04.01.2024 SMOKE DETECTOR NOTIFICATION 2557387