TIMS showed Smoke External Alarm at Front DT car . Staff(BSH) checked and confirmed no signs of smok e / fire / burning smell on exterior or interior of train. R ear T409 line clear and confirmed no abnormalities. ~~~~~ To check/replace ext smoke detector and reinstall SDR11 FSD Check no sign of water ingress,suspect intermittent fault.C/O as preventive measure.SOR11 install and FSD c/o done. Function test ok. #3607-FSD:- Not: 2478060 raise. Done by Rizman/Sanip.07/04/23 3607 TIMS showed Smoke External Alarm. Staff(BSH) confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Rear T409 line clear and confirmed no abnormalities.  3607 Smoke External wi5th FC 721. Removed SDR11 Relay& tagged panel. Junaidi 45022