Train doors at Rear DT car were not proven closed. TC recycled train doors a few times - ok. Staff(B SH) checked and confirmed no train doors abnormalities. Faul t did not recur at subsequent stations. ~~~~~ Train doors at Rear DT car were not prov   3625 A1 fault code 023 occurred 4 times. Open Close speed pass: Y FOD found: N Door cycle 20x: Y Rubbing marks: Y - rubbing marks at RHS 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: Checked door guide rail gap - LHS: 18.58mm, RHS: 18.07mm. Adjusted RHS to 18.61mm and serviced the rubbing mark/weather strip. Conducted door static test ok, door cyclic test ok. To further monitor in mainline. Done by: Saini/Asruddin/Haslan 11.07.2023