TC reported Train doors at Car 3612 not proven closed. TC recycled a few times but to no avail. Pax was disembark at JURMT. TC operated DIRBS - ok. Train return ed to UPD. ~~~~~ 3612 TC reported Train doors not proven closed. TC recycled a few times but to no avail. Pax was disembark at JURMT. TC operated DIRBS - ok. Train returned to UPD.  3612 Fault duplicated by opening saloon doors from #3612 B/S and closing from #3611 A/S. ER showed #3612 DORB always energise after VOBC switchover despite attempts to command close from #3611. Measured resistance across M2-M2 coupler pins, 5.4k? (NG). Found #2611 coupler pin 89 (wire 22) entrapped with bundle of hair/dust. Uncouple and clean coupler pins. Continuity check ok. Function test #3611 A/B side door open and close from #3612 and vice versa, satis.  Elfyan/Irwan/Justin 45317