MamaGoose,
Assuming that your refer is "unfixable" and you do not want to explore the residential alternative, another choice that many make is to replace the back of your current Norcold with an Amish unit. The Amish units seem to be a lot better made than the Norcold backs. And, most importantly they do not seem to be the serious fire hazard that the Norcolds are turning out to be. You just don't hear about fires in conjunction with the Amish units.
One critical factor in your choice, however, is how are your seals on your current box. If they are good (and show resistance when you put a dollar bill between the door and the box and it has friction when you pull on it) then the Amish unit is a cost effective way to go. If your seals are bad, however, be aware that the seals are not sold separately, and the "shells"/frames for the large doors cost around $424 each. So, this can be a real factor in "fixing" your current box.
So, a lot depends on the condition of your current box. But, this may all be academic since you will probably get a fix to your problem that will keep you in good shape for the time being and give you more time to investigate alternatives.
