TC reported smoke external at rear DT car. Staff (BGB) checked and confirmed, no abnormalities. T232line clear from JURMT - BBT2, and feedback, no abnormalitie s. TC reported smoke external at rear DT car. Staff (BGB) ch ~~~~~ TC reported smoke external at rear DT ca #3560-Smoke detector no water ingress on PCB side.C/O as preventive measure.Function test ok. #3560-Smoke detector:- Not: 2481594 raise to CSC Done by Koh/Jack. 20/04/23