TC reported Smoke Internal Alarm at RearM1 car. Staff (SIM) checked the train and feedback no signs of heat nor smoke. Train was escorted to terminal station. ~~~~~ * ,N * Fault unable to duplicate. TIMS recorded  1527 FC-720 Smoke internal occurred once and resettable. No signs of water ingress at FRP. Checked found 1527 #2 end internal smoke detector dusty. Cleaned detector unit, inlet and exhoust pipe. Monitored an hour with no fault triggered. DONE BY:SANKAR/A.TALIB 14.09.2023