TC reported train doors not proven closed. TC recycled train doors a few times to no avail. SM(TCR) isolated rear DT B2 door for train to depart. Stock changed arranged at CHD ~~~~~ L3 Download event record at card [5] and download door operation trace data.    Normalised door and carried out function checked.[OK] Fault unable to duplicate at depot. Door leaf gap measurement.[63.5mm]. Door lock S/W integrity 1 and 3.[66kohms]                          2 and 4.[66kohms] When door at close position used pull gauge to pull over 20kg still unable to open. Replaced faulty door operator. 3682 B2 door operator S/N: OLD:1602W0200215. NEW:D18YF0085009. N.ATeh.A.M /Hadi/22.02.20. ---------------------