Hi Guys, well looks like I'm on the right track and must say I couldn't have done it without my "Crew" at RV.Net!
That fridge is quite fascinating when you probe a little deeper into the working components on the gas side. I guess we could call it the Faraday Fridge based on its "absorbtion" principle. I would really like to understand all this more so have opened up another area of study.
I found this guy who even has a happy little diagram showing all the nuts & bolts of the typical LP fridge :::
http://bryantrv.com/reefer.html