TC reported obstacle detected at FDT car'A2' side. TC opened and closed thrice to clear the fault. Staff(WDL) checked and confirmed 'A2' door needed to be push ed manually. ~~~~~ TC reported obstacle detected at FDT car     #3719-A2 door before cleaning push pull resistant 8kg,mating strip top 65mm.Check DLS red mark ok.Remove door and change roller on the LHS door.After cleaning push pull resistant 7 kg pull resistant 7kg mating strip top 63.6mm.Check DLS red mark ok.Check DLS 15.3mm check DLD cushion ok.DLS & DCS function ok.Door opening/closing timing/static test pass.Cleaning J-rail guide rail check for FOD & door rubbing mark ok.Swap DLD from #3719-A1 to #3719-A2. Done by Haslan/Kalees.  15/11/22