TC reported TIMS showed intermittent obstacle detected at car 2605 'A2' door.Staff(ORC) checked an d confirmed car 2605 'A2' door opened but was jerky at closi ng. Train was stock change over at AMK NB with spare train l ~~~~~ TC reported TIMS showed intermittent obstacle detected at 2605 A2   Checked #3605 A2 checked door operation satis. Instead found #3605 A1 door with heavy vibration. Replaced #3605 A1 RHS outer roller and serviced guide / J-rail. Function tested satis. Done by Koh Boon Seng, Sanip. 14/11/2023 (N).