John,
I would have replaced just the cooling unit but the inside of the refrigerator was all yellowed. We thought it was due to the previous owner using some type of cleaner that discolored it but one of the professional guys that work on these and help us out here on the forum,Chris Bryant, responded that the yellowed plastic liner is a sign that the ammonia has leaked into that compartment. If only I would have mentioned that earlier, it would have saved me lots of work. Because of the yellowing we decided to buy a complete unit. One really good part of this rigamarole that I went through, I discovered that the gas pressure was only 9.8 inches of water column. I turned it up to 11 inches and now the cook stove lights off much better. The extra pressure is evidently making the gas get to the sparker quicker.
Here is a link to the discussion that led to Chris figuring out the clue to reason for all my headaches...
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/29836674/srt/pa/pging/1/page/1.cfm