TC reported that front DT A-4 door did not open. Staff(YIS) checked and confirmed front DT A-4 did n ot open while all train doors opened at station. Sticker putup and stockchangover done at JURMT. ~~~~~ 3638 TC reported A4 door did not open. Staff(YIS) confirmed A4 did not open while all train doors opened at station. Sticker put up and stockchangover done at JURMT.  3638 LHS outer roller delaminated - Replaced. Tested operation - OK. Checked for FOD - N . Clean J-rail & guide rail. Door static test - OK. Checked DIR - OK. Push/Pull test - no wobbling or abnormalities found. Alif/Fazly/Chan SW 45244