Rear DT car 'B1' door not proven closed.TC opened and closed train doors once - ok. Fault recurred at MSL SB. Staff (ADM) checked and feedback no abnormalitieswith the door. Fault did not recur since WDL SB. ~~~~~ 3624 - Rear DT car (3623) 'B1' door not proven closed. TC opened and closed train doors once - ok. Fault recurred at MSL SB. Staff (ADM)checked and feedback no abnormalities  with the door. Fault did not recur since WDL SB.(L3) CE checked:3623 All doors proven open and closed Depot 3623 train door operartional check. L3 As above mention , 3623 B1 door FC 933, Push/Pull 7Kg, mating:64.2, Do normal check and cleaning ,Jrail, guide rail, FOD ok, check and rubbing mark ok. Door opening/closing several time and static test ok Done by Saini/Haslan/Asruddin 45194 Further check L3 3623 B1 Door found RHS & LHS rollers, rubber slipping from bearing, Replace done and function test door ok. Mating within criteria, Push/pull within criteria, DCS to plate ok. DLS red mark present. Door cyclic test and static tet ok Done by koh/Sanip 25.09.23