TIMS showed Smoke Internal at car 1520.Staff(AMK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Train was es corted to terminal station. ~~~~~ 1520 TIMS showed Smoke Internal. Staff(AMK) checked and confirmed no signs of smoke/fire/burning smell on exterior or interior of train. Train was escorted to terminal station. CE checked: 1520 TIMS showed smoke internal 11784408 - 2100hrs  1520 #1 registered FC. Checked but found no abnormalities. No Accumulation of dust/dirt or water ingress in the duct. Opr 20 raised to check smoke detector. Swapped 1520 SDR1 with 2520 for monitoring. Shaun 45194 BSD: To check 1520 no1 end smoke detector condition. To twd/bsd.  1520 SDR1 Alarm( fire control panel) feedback by CE. 1520 NO.1 END check no abnormality on the smoke detector unit. Preventive C/o smoke detector unit due to fault. Function test ok. To monitor 1520 Smoke detector unit Notif csc:2527051 Done by:Saini/Asruddin/Haslan 45195