TC reported train doors at car 3636 didnot opened. Staff(BGS) checked and confirmed car 3636 'A1' d oor did not opened. Staff(BGS) later normalize the door mech anism and train door was able to open and close normally. TC ~~~~~ * ,N * 'ER downloaded. Checked 3636 A1 door able to open/close. Upon further door operation, found 3636 A1 LHS door wobbling. Removed LHS door leaf and found 1x LHS roller delaminated. Replaced roller. Further found isolation device damaged. Replaced isolation device. Restored door leaf and adjusted door rubber strips to 63.5mm. Function tested ok. Door operating smoothly. DONE BY:LAI MK/AZLI/FAIZAL/ALI  05.06.23