TC reported train doors did not opened but PSDs opened. TC requested to open train doors in ATPM andRMF mode but to no avail. CCTV at CTH NB showed train doors were opened and staff(CTH) checked and feedback train doors  ~~~~~ TC reported train doors did not opened b     Checked no FC was triggered during faule reported timing.Unable to duplicate fault,postulate intermittent failure of DMCBA as most probable root cause based on circuit.Checked DMCA found no burn marks or physical defects.Voltage drop across circuit breaker satis.No signs of water ingress.Checked #3561 A side door manget valves,no burn marks or signs of water ingress,continuity and coil ressistance-satis.No signs of shorting and no stray voltage found.Door cyclic test ok ,operating current less than 2A.Checked DOIRA,DORA,DKA, all ok.Preventiv replaced DMCBA on #3561.Door cyclic test x 20 ok.No tripping observed. Done by Johari 28/12/22