TIMS showed Smoke Internal at RM2 car. Staff(AMK) checked and confirmed no signs of smoke / fire / b urning smell on exterior or interior of train. Train was esc orted to terminal station. TIMS showed Smoke Internal at RM2 ~~~~~ TIMS showed Smoke Internal at RM2(2531) car. 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: 2531 fire internal 1 reset ok n no abnormality found  Found smoke internal detector sensor dusty. Serviced the sensor and function tested ok. Monitored no false triggering of smoke alarm. Done by: Jack/Koh/Rizman 15.4.24