TC reported 3rd pair of train doors didnot open. TC confirmed TIMS showed obstacle detected at the FDT car 3rd pair of train door. SM (KRJ) checked and confirm ed train door did not opened and assisted to isolate the tra ~~~~~ T208 3608 (S) TC informed front DT(3608) A3 door was unable to open at CCK SB. TC confirmed TIMS showed obstacle detected at the FDT car 3rd pair of train door. SM (KRJ) checked and confirmed train door did not opened and assisted to isolate the train door in closed position SBW SB   No FC found. Door was isolated by station staff. Door was found to be very wobbly and stiff. Found 3608 A3 LHS and RHS outer main roller delaminated. After roller change out: 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: Changed out 3608 LHS and RHS door rollers. Cyclic test found no abnormalities after. Static test door speed satis. Done by: Jack, Rizman, Sanip, Koh 45145