How can I remove & repair the Ice Flap on a samsung RS21DCNS?

The ice flap trigger mechanism on the freezer door appears to be broken. When you place a glass against the trigger it does no open the flap, as normal, to allow the ice down the shute. From what I can see the linkage between the trigger switch on the door and the internal ice flap, which seals the ice shute, is either disconnected or broken. How do I gain access to the mechansim to repair or replace these components, do I remove the temperature control panel and are there srews holding it in place?