TC reported train door at Front DT car 'A2' door did not opened. TC feedback TIMS show "Obstacle det ected." Train is a withdrawal train to UPD. TC reported trai n door at Front DT car 'A2' door did not opened. TC feedback ~~~~~ 3620 TC reported train door A2 door did not opened. TC feedback TIMS show "Obstacle detected." Train is a withdrawal train to UPD.  3620 A2 train door checked & confirmed L/H/S Outer roller    delamination. Replaced roller done. Function test door - OK. Door timing check - OK. 10mm & 20mm Door gauge check - OK. No abnormalities or fault occur during testing. Huzzaidi/Haziq/Hairi/Junaidi 45251