TC reported TIMS showed Rear M1 car FireExternal Alarm. Rear T339 feedback no abnormalities observe d. Staff (GCL) checked the train and feedback no signs of he at nor smoke in train. ~~~~~ #1516 fire external alarm.replaced #1516 smke detector unit.reinstall sdr11 relay.function checked /tested ok.HAIRUL/AZHAR 04.03.2023 S/N NEW  KSF SD-015     OLD- NIL NOTIFICATION 2467487  refer to mo 11607673.hairul/azhar 04.03.2023