TIMS showed obstacle detector indicationat car 3614 'B4' door.Staff(SBW) checked and feedback Rea r DT car 'B4' door did not open when all train doors were op ened. The door was later isolated by SM(WDL) ~~~~~ TIMS showed obstacle detector indication No FC at 3614, found B4 door roller at RHS (outer) door damaged. After replacement of rollers: Open Close speed pass: Y FOD found: N Door cycle 20x: Y Rubbing marks: N    Door Push/Pull force: ok Door mating gap: ok Check Door Lock Switch red line when door closed - ok Door Lock Switch Cushion Rubber intact: Y Door Close Switch distance from actuating plate - ok Door Wobble: N Rectification Actions: Replaced the damaged door rollers. Static and cylic test passed without any abnoramalities. Serviced J rail and guide rail Done by: Koh/Rizman 12.07.2023