Train doors at rear DT car 'B4' not proven closed. TC opened and closed train door once - ok. Staff MSL checked no abnormalities. ~~~~~ Train doors at rear DT car 'B4' not prov #3625-B4 door fault code 993(1 time)Before push/pull force-9kg door mat-64.0 Check J-rail,guide rail no FOD and rubbing mark.Service & clean J-rail & guide rail.Check DLS-red mark ok.DCS to plate 15.3.DLD rubber cushion ok.Function check DLD,DLS and DCS ok.Door opening/closing timing static test ok. Done by Saini/Zulq. 10/02/22