Customer Relations staff informed thereis a feedback a pair of train doors not opening on car 2615.Staff(SOM) confirmed fault at B2 train doors and isolated i t. Train was tock change-over at AMK NB. No delay. ~~~~~ Customer Relations staff informed there is a feedback a pair of train doors not opening on car 2615.  Staff(SOM) confirmed fault at B2 train doors and isolated it. Train was tock change-over at AMK NB. No delay.   Checked and found #2615 B2 RHS outer door roller delaminated. After door roller change out Open Close speed pass: Y/N 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: Change out 2615 RHS door rollers. No abnormalities with cyclic test and static test; DIR/DMI able to extinguish. Door operation was smooth. Service J-rail and guide rail. Done by: Koh/Jack 10.07.2023