TC reported obstacle detected at car 3609 B4 door. Fault keep recurring from CCK SB to SBW SB. Staff(YIS) checkED car 3609 B4 door and feedback no abnormarliti es. ~~~~~ TC reported obstacle detected at car 360     Check and found #3609-B4 RHS door main roller damage,c/o ok.J-rail & guide rail clean ok.Mating strip,push/pull,DLS,DSS check ok.Door cyclic and static test ok. Done by Koh/Sanip.  08/02/23