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That seems like a good spot to check. I would hook this up directly to a power source and bypass all the controls and see if it cools or freezes. When you have a fridge that won't cool on either mode, it can be the cooling unit going out with a blockage or leak. Either of those can cause erratic cooling. Let me know where you are and I can suggest a parts outlet.
I am adding a link to the parts list for this model. You would want part #7 on the diagram. That should be a good source as well, but if they can't get it for you let me know. All follow ups are included in our fee. http://caravansplus.com.au/catalog/product_info.php?products_id=11740
Just checking back in to see if you were able to resolve this issue or do you still need some input from me?