1616 TC reported TIMS showed abnormality ~~~~~ 1616 TC reported TIMS showed abnormality at A4 door. SM (BGB) confirmed door did not opened at station. SM(BGB) later isolated affected train door at BBT1.  1616 A4 door unable to open but no FC registered. From ER, TC did not cycle doors. Checked/found both door leaves rollers delaminated, thus causing doors unable to open. DLD/DLS/DCS & weather strip condition checked - OK. Replaced the rollers. TIMS door static timing test - Passed. Door gap = 63.5mm, door cyclic test 20x, DIR extinguished - OK. Door open/close timing within criteria.  Celine Tan 45061