TIMS showed Smoke Internal & Lost Powerat Front M2 car. Staff(ORC) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of tr ain. TIMS showed Smoke Internal & Lost Power at Front M2 car ~~~~~ Checked and found smoke internal at no.1 end. PCB heavily oxidised. Replaced smoke detector and function test-ok. #2556 smoke internal c/o: Notification no: 2574463 #Smoke detector sensor housing crack: Notification no: 2574464 Done by: Rizman and Koh