TIMS indicated Fire Internal in rear M1car. Staff (YCK) checked and feedback no signs of fire, heator smoke in the affected car. Train was escorted to termina l station. ~~~~~ 1613 TIMS indicated Fire Internal. Staff (YCK) feedback no signs of fire, heat or smoke in the affected    car. Train was escorted to terminal station.  1613 FC 720: smoke internal. Checked no.1 and no.2 end smoke detector. No signs of dust and water ingress. Function check smoke detector - ok. No fault reoccurred.  Swapped SDR1 from #1613 to #2614 and SDR2 from #1613 to #2613. OPS 20 raised to check #1613 internal smoke detector.  Haiqal/Junaidi 45453 ADDL: 1613 TIMS indicated Fire Internal.  Check and found internal smoke detector sensor dusty, clean up by compress air annd function test ok. Done by: Sanip and Jack. 26/06/2024.