Train doors at car 3609 'B1' door were not proven closed. TC recycled train doors once - ok. Staff(B DL) checked and confirmed no train doors abnormalities. Faul t did not recur at subsequent stations. Train doors at car 3 ~~~~~ L3 Check FC933 (CLE) X 5 Open Close speed pass: Y (door wobbly) FOD found: N Door cycle 20x: Y (door wobbly) Rubbing marks: N Door Push/Pull force: 10.5kgf Door mating gap: 64mm Check Door Lock Switch red line when door closed (should be at half or at most flushed with the step) -satis Door Lock Switch Cushion Rubber intact: Y Door Close Switch distance from actuating plate - 15mm Door Wobble: Y Rectification Actions: Found #3609 B1 RHS door outer roller  delaminated. C/O both RHS and LHS door rollers to iron black rollers. Mating strip, push/pull, DSS, DLS, door cylic and door static test check-ok. Check DLS locknut -secured Done by: Kumar and Din