Train doors at car 1507 were not provenclosed. Staff(WDL) checked and confirmed that car 1507 'B4' door was fully opened, unable to close. Staff(WDL) assistedto isolate the defective pair of train doors in closed posit ~~~~~ Train doors at car 1507 were not proven closed. Staff(WDL) checked and confirmed that car 1507 'B4' door was fully opened, unable to close. (L3) Depot to check 1507 train doors operation L3  Checked and found B4 door manifold and door actuator fault. Changed out and function tested ok. Door gauge 10/20 mm test pass. DIR indication checked ok. 1507 B4 door actuator OldSN: 110143 NewSN: 100311 Notif: 2513634 1507 B4 door manifold SN:   Notif: 2513633 Done by: Jack Koh Rizman 45148