B1 train doors at the front DT car werenot proven closed. TC recycled train doors for a few cycles but to no avail. Pax were disembarked at JUR MT. DIRBS was o perated for train to depart. Staff (JUR) subsequently update ~~~~~ 3603 B1 train doors JUR MT were not proven closed. TC recycled train doors for a few cycles but to no avail. Pax were disembarked at JUR MT. DIRBS was operated for train to depart. IMDC(RS) & LTOC were informed. CE: All doors proven open n closed , no DIR lit. Pls check door operations at depot.  3603 replaced DLD with new spare. Swapped #3603 A1 DCP to B1 & function test open/close doors multiple times - OK. Performed 10mm/20mm door gauge check, no abnormalities found.  Farid/Koon PL/Zulfudhly/Amir/Haiqal 44960 #3603 DLD S/N : OLD : C151BDL145069 new : C151CDL181013 #3603 DCP S/N : (after swapped) A1 Door : 1701W020071S026 b1 dOOR : 1405W020041S006