Train doors at rear DT not proven closed. TC recycle doors once to clear fault. Fault did not recur at subsequent stations. Train doors at rear DT not proven cl osed. TC recycle doors once to clear fault. Fault did not re ~~~~~ Train doors at rear DT not proven closed     Check Tims observed FC933(Saloon door B1 CLE)occured twice.From fault trace showing door gap during fault was 192cm & 12cm.Check & found no FOD along guide rails.Door mating strip gap.DCS distance DLD cushion & DLD red line rigging all ok.Further check no wobbling from door rollers & push/pull resistance 6.8kg ,ok.Found dirt build up on J-rails,preventively serviced J-rails & perfo door cyclic test ok.Door static test,all doors timing within criteria. Done by Arthur Sam  31/01/23