Siemens Fridge Freezer with Ice and Water dispenser

I have a major water leak from the water dispenser in the freezer door of my Siemens KA58NA40GB/07 Fridge Freezer. After being told that I will most likely have to replace the door at £300 plus labour. This is most likely a ruptured plastic tube or connection I am trying to find out how to access this unit to acertain which parts need replacing, not the whole door I hope. I think access is through the dispenser panel on the front of the freezer door. How would this be done, as I can see no screws or any fixings and the exploded diagrams sent to me by Siemens are useless. I am concerned that if this is done wrong it will badly damage the panel surround and or the door. So far I can’t find anyone who has effected such a repair to give advice so thats why I’m here, can anyone help me with this please?