TIMS showed Smoke External Alarm at Front DT car. Staff(NOV) checked and confirmed no signs of smoke/ fire / burning smell on exterior or interior of train. Re ar T204 line clear and confirmed no abnormalities. ~~~~~ TIMS showed Smoke External Alarm at Fron     Check and found smoke detector water ingress. C/O and function test ok.SDR11 install back. Not: 2473802 raise. Done by Koh.  24/03/23