TC reported TIMS indicated Front DT car A1 door, was unable to open. Staff (NOV) checked and confirm ed Front DT car A1 door was unable to open and initally unab le to isolate. Staff(ORC) assisted to isolate Front DT A1 do ~~~~~ TC reported TIMS indicated Front DT car     #3632 Fault Code 023 x 1.Check and found 3632-A1 door LHS roller damage.#3632-A1 LHS roller c/o done.Mating-6.3~63.5 ,Push/pull-6.62kg.DLS red line check found criteria a bit out,adjusted-o rubber cushion check ok.DCS to plate-14.7.Door static abd cyclic test ok. Done by Jack/Koh. 14/11/22