Train doors at rear DT car 'A2' doors were not proven closed. TC recycled train doors to no avail. S taff(CTH) informed that the aforementioned doors were stuck half way and had to be pushed close. SM(CTH) updated that th ~~~~~ 3534 A2 Train door were not proven closed. TC recycled train doors to no avail. Staff(CTH) informed that the aforementioned doors were stuck half-way and had to be pushed close.  3534 A2 door replaced the door rollers. Security/function check - OK.  Alan/Lee PT/Shafie 44563