TC reported train doors at car 3644 didnot opened. Staff(BGB) checked and confirmed car 3644 'A4' d oor did not opened. Train was escorted to terminal station. ~~~~~ TC reported train doors at car 3644 did not opened. Staff(BGB) checked    and confirmed car 3644 'A4' door did not opened. Train was escorted to terminal station.  3644 A4 LHS, Before cleaning Push/pull resistance wobble . mating strip:64.3, check DLS red mark ok. remove door and change bearing LHS door due to door roller spoilt. After cleaning push/pull resistance 6kg, push/pull 7kg. Mating:64.0mm Do normal check and cleaning done Jrail, guide rail, check No FOD, rubbing mark ok. DLS red mark ok, DCS to plate 15.0mm, DLD rubber cushion ok, DLS and DCS function ok. Door opening ok. Door opening/closing, timing static test pass. Done by Haslan/Firas 45194