TC reported TIMS showed Smoke Internal at rear M2 car. Staff(BSH) checked and found no signs of heator smoke in the rear M2 car. ~~~~~ TC reported TIMS showed Smoke Internal a Check and found #2510-no 1 smoke internal detector dusty,use compress air to clean and function test ok.SDR1 install back. Done by Sanip/Imran/Koh.  07/05/23