TIMS showed Smoke Internal at Front M2 car. Staff(ALJ) checked and confirmed no signs of smoke / fir e / burning smell on exterior or interior of train. Train wa s escorted to terminal station. ERS-13 ~~~~~ * ,N * 'Fault unable to duplicate in depot. Monitor for an hour no fault triggered. Due to last swapping history, SDR1 was swapped from 1563 to 2564 on 17/09/23. Replaced SDR1 relay and function test ok. Monitored for an hour with no fault triggered. DONE BY:LAIMK/FAIRUZ 21.09.2023