Train doors at rear DT B side were not proven closed. TC recycled train doors once - ok. Staff(CBR) checked and confirmed no abnormalities. ~~~~~ Train doors at rear DT B side were not p     #3645-A2 door CLE remove door and check roller found door roller having grease surrond the roller.Clean up roller grease ok.Jrail    & guide rail clean ok.Check Mating atrip,DLS,DLD,DSS check ok.Push/pull ok,cyclic & static test ok. Done by Koh. 19/04/22