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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
Do you have a small digital multimeter so we can actually take a DC voltage reading at the rear of the fridge while it is running? That would be the fastest way to track this down.
We need to test it when you are running the vehicle and have it on 12 VDC mode. Can you get to the rear of the fridge easily to the wiring?
I am attaching a link to the User's Manual for this model. See the back diagrams and it shows where that lug is for the vehicle 12 VDC hookup. Just to the lower right of the control board. That would be where you would check it. IF you have power there when the engine is running, then the next thing would be to check the internal fuses and leads to the 12 VDC element and see if there is 12 VDC to the element. IF not, then the board may be suspect. If there is then you need to see if that keeps the temps cold as you travel. http://www.dometicrvcentre.com.au/documentmanager/item/175
No outside inspection panel? There should be one as that allows the proper ventilation to go into that area and up through the coils for cooling. Did you look at that part of the manual?
Since I didn't hear back from you I am wondering if you were able to resolve this issue or do you still need some additional input from me here?