TC reported train door 'A3' at car 3615did not opened. Staff (JKN) checked and confirmed car 3615 ' A3' door did not opened. Staff(JKN) and (PNR) unable to isol ate the defective train door in closed position. Train was e ~~~~~ * ,N * Checked and found 3615 A3 saloon door RHS leaf one of the rollers delaminated and isolation device damaged. Replaced roller and isolation device. Function test door operation ok and door able to isolate, normalised 3615 A3 door afted isolation test. DONE BY:TEH A.M/LAI 28.10.2023