TIMS showed 'Smoke Internal' at RM1 car.Staff(AMK) checked and confirmed no abnormalities.Rear T213 did line clear feedback no sign of smoke between BDL1- BSH1.Station staff was arranged to escort the train. ~~~~~ To follow up.  1542 replaced SOR1 relay on FCP. Function test & found no abnormalities.  Jonathan Koh 45135 1542 TIMS showed 'Smoke Internal'. Staff(AMK) confirmed no abnormalities. Rear T213 did line clear feedback no sign of smoke    between BDL1-BSH1. Station staff was arranged to escort the train.  1542 FC 720 (smoke external). Checked No.1 end smoke detector - OK. Checked/found FCP was previously swapped from #3542 to #1542. OPS 20 raised to follow-up.  Celine Tan 45135