How to fix a beko ap930 fan?

Me beko American style fridge freezer has started to freeze food in the bottom of the fridge but the top of the freezer is not freezing at all I have read that it's the fan behind the ice maker but I'm unsure on how to fix this i have found the part on ebay and would like to have a go myself I have read that the ice maker needs to be removed then then remove the back is this the back behind the ice maker Or the main back of the fridge as this is riveted on I have looked all over the net but can not find any more info than that also does anyone know were I can find a drawing or photos to help me
Thanks
Chris