TIMS indicated car 3644 'B4' door obstacle detected when train doors opened. Thereafter, train doorswere not proven closed. TC opened and closed train doors on ce - ok. ~~~~~ TIMS indicated car 3644 'B4' door obstacle detected when train doors opened. Thereafter, train doors were not proven closed. TC opened and closed train doors once - ok. CE: (3643) RDT car 3644 earlier train at CBR, B4 did not open due to obstacle detected. When train arrived at AMK's middle platform B4 door able to open. Train proceeding back to bsd depot, unable to monitor further.  Check 3644 B4 fault code 986,980. Confirm 3644 B4 door RHS roller delaminated, Replace and Function test ok, Static test ok. Door matt-withni criteria, DLS red line ok, Push/Pull ok, DCS ok. Done by Rizman/Kalees 45135