TIMS showed Smoke External at RM2 car. Staff(CBR) checked and confirmed no signs of smoke smell on e xterior of train. Rear T439 line clear no abnormalities. ~~~~~ 2665 TIMS showed Smoke External. Staff(CBR) confirmed no signs of smoke smell on exterior of train. Rear T439 line clear no abnormalities.     2665 SDR11 relay isolated & tagged. Security checked - OK. Opr 20 to check External smoke detector. Elfyan 45016 To check external smoke detector and plaseal #2665 check smoke detector unit no sign of water ingress.For preventive measure c/o smoke detector and function test ok. #2665 Smoke detector c/o: Not: 2475936 raise. Done by Saini/Zulq.  31/03/23