TC reported smoked external at Front M1car. Staff (YCK) checked and confirmed no signs of smoked. T 409 line clear confirmed no smoke. TC reported smoked extern al at Front M1 car. Staff (YCK) checked and confirmed no sig ERS-13 ~~~~~ 1606 TC reported smoked external illuminated. Staff (YCK) confirmed no signs of smoked. T409 line clear confirmed no smoke. TC reported smoked external at 1606 car. CE: 1606 Smoke External pre-alarm. Unable to reset. Isolated toggle switch TC reported Front DT car fire external p     #1606 replace new smoke detector and test ok. Not: 2471084 raise. Done by Haslan/Asruddin. 17/03/23