Hi Warren
If your fridge is going all the time and not coming back to temperature ,i put in a small computer fan ,tie it to the top rail with some cable ties ,wired it up to the power from the door light ,this then moves the air around ( must blow onto the back plate of the fridge ) and i have found it works extremely well in 35/40 c temps .
I have had 2 computer boards put in so far ,the fridge is the week link in a Kedron caravan every thing else works very well.