TC reported smoke external at front DT car. Staff(YCK) checked no sign of smoke and no abnormalities . Rear T405 line clear no abnormalities. ~~~~~ TC reported smoke external at front DT c     Found water seepage in to smoke external detector PCB area.Replacve smoke detector and function test ok. Smoke detector:- Not: 2467957 raise to CSC.    Done by Sanip/Koh.  06/03/23