TC reported to CMT when stepping out atJURMT, one pair of train doors did not open at Rear M2 car ' B' side. Stepping in TC checked and confirmed TIMS showed noabnormalities. ~~~~~ 2644 TC reported to CMT when stepping out atJURMT, one pair of train door B/S did not open. Stepping in TC checked & confirmed TIMS showed no abnormalities. CE : T218(3643) RM2 car 2644 check doors(b/s) ops found all four doors able to open/close without difficulty.  2644 No FC found. FOD found: N Weather strip condition ok: Y Roller condition ok: N, #2644 B2 & B3 RHS outer roller delaminated. Clean J-rail & guide rail: Y Door cyclic test 20x, DIR extinguish ok: Y, after rectification TIMS door static timing test pass: Y, after rectification Door lock switch red line flush: Y Door close switch actuating plate distance ok: Y Checked all 4 doors on #2644 B side. Replaced #2644 B2 & B3 RHS outer rollers.  Chan SW/Aliff/Daniel/Redzwan 45198