Train doors at car Rear DT car were notproven closed. TC recycled train doors a few times to no ava il. Step out TC assisted in locating defective train doors, confirmed that the Rear DT car 'A2' train doors were not pro ~~~~~ Train doors at car Rear DT car were not     #3614 door fault is B2 with sticker and not A2.A2 door check ok ,B2 door observed multiple time happen FC-956/953.Fault trace and PTU al downloaded in PTU006. Observed B2 door manual release cover was open but handle in normal position.No FOD found and mating strip/push pull within cateria.Further check found DLD rubber cushion stick on top bracket.Replace DLD and function test ok.Door cyclic and ststic test ok. Door DLD- Old s/n: C151BDL 142015 New s/n: C151BDL 194004 Not: 2331497 raise. Done by Sanip/Koh/Faddzal. 12/11/21