All train door proven closed but DIR remained lit. TC operated ADBS but DIR still unable to extingui sh. TC opened and closed both cab doors to no avail. Pax dis emarked and DIRBS operated for train to depart. ~~~~~ Check #3614 FC: 063, CLE. Further check found B2 door left side main roller rubber delaminated and dislodged from roller. Replaced roller ok. Check door mating strip, DLS within criteria. Carried out door cyclic test ok. Done by Koh. 27/09/20