Samsung RSG257AARS
Replaced flapper door for ice route. This is how I did it. Wasn't too bad a project.
Unplug refrigerator. Remove 1 small screw under display unit. Locate two slots at forward, lower corners of display and insert screwdriver into slots one at a time and twist 1/2 turn and pull outward. When bottom coroners are loose grab display and pull outward and upward to remove display unit. Disconnect connector and set display unit aside. The ice route unit is now exposed. Move water line out of the way. Remove two screws and unlatch two black snap latches and remove unit with door. Unplug connectors.
Pry door pivot hinges apart a little bit and push down on door pivot shaft on one side to unsnap and then do the other side. Install new door with spring by winding the short leg of the spring from the top of door seal into the slot in ice route housing. Pry door pivot hole and shaft slightly apart and snap in place by pushing upwards. Door should now be spring loaded to the up or closed position. Reinstall ice route unit, water line and display panel.