TC reported FDT car, A4 train door did not open. Staff(KRJ) checked and confirmed FDT car, A4 train door did not opened and proceeded to isolated the train doorin closed position. TC reported FDT car, A4 train door did ~~~~~ TC reported FDT car, A4 train door did n   #3643 FC 082 Saloon Door A4 Open Operation Timeout Open Close speed pass: Nil FOD found: No Door cycle 20x: Nil Rubbing marks: No Door Push/Pull force: Nil Door mating gap: 63.5mm Check Door Lock Switch red line when door closed ok. Door Lock Switch Cushion Rubber intact: Yes Door Close Switch distance from actuating plate: 14.5mm Door Wobble: Nil Rectification Actions: Found #3643 A4 LHS outer door roller delaminated. Replaced both LHS and RHS door rollers with iron rollers. Checked guide rail, J-rail satis. Door function test ok. Checked mating strip, push pull, DLS red line, DSS satis. Door cyclic and static test ok. Done by: Jack, Koh, Rizman (3/3/24)