TC reported Fire external at Front M2 car. Staff(BSH) checked, no sign of smoke or fire. Rear T408 l ine clear into BSH NB, no abnormalities. TC reported Fire ex ternal at Front M2 car. Staff(BSH) checked, no sign of smoke ~~~~~ TC reported Fire external at Front M2 ca        #2558-Change out ext.smoke detector and tested ok. Not: 2470804 raise. Done by Firdaus. 15/03/23