TIMS indicated Fire Internal in rear DTcar. Staff (KTB) checked and feedback no sign of fire or smo ke inside the train. Train was escorted to the terminal stat ion. TIMS indicated Fire Internal in rear DT car. Staff (KTB ~~~~~ TIMS indicated Fire Internal in rear DT   #3504 checked and found no 1 end internal smoke detector sensor dusty. Cleaned with compressed air and checked PCB ok, no signs of rust or    water ingressed. Function test ok. Done by: Saini, Din (1/4/24)