Train doors at Rear DT car were not proven closed. TC recycled twice to clear fault- ok. ~~~~~ Train doors at Rear DT car were not prov     FC 933 saloon door B1 CLE static test pass.FOD not found.Door cycle 20x ok,no rubbing marks nor wobbling.Door push pull force ok.Door mating gap ok.Door lock s/w red line ok. Service J-rail & guide rail.Postulate FOD dislodge when TC cycle twice. Done by Luke.  02/03/23