TIMS showed Fire Internal at car 1526. S3525/ taff(YCK) checked and confirmed no signs of fire on exterioror interior of train. Train was escorted to terminal statio n. TIMS showed Fire Internal at car 1526. Staff(YCK) checked ~~~~~ TIMS showed Fire Internal at car 1526. S Open up #1526-#1 air return grill and cleaned up all area and function test ok. Done by Firas/Fazil 07/05/23