Dometic fridge question

Hi All,

We have a 7 year old Dometic 3-way fridge (Model No. RM 4401 and it is a type C40/110) in our Jayco Heritage caravan.

The whole time we have had it (5 years), the fins located at the top rear area of the fridge section freeze up but on the right hand side only.

I have tried rearranging the contents to allow for more air flow, but this does not seem to make any difference. The fridge seems to work fine and I just turn it off and defrost to solve the problem.

Have always presumed "this must be the way it is", but I'm now wondering if anyone can shed any light on this?

Thank you, Annette (aka Thermowoman)