I had the same thing happen in my 2000 Lance 1140. Amonia leaked out of the refer core. I initially took it in for a repair and they wanted to replace the unit for over $2000 and the replacement was only a two-way refer.
I Decided to do the work myself. There are several places online where you can order a refurbished core. I was able to pull my fridge, replace the core and reinstall. All total, it was about 5 hours of work and about $500 for the replacement core. Fridge still works great.
The hardest part of the project was getting the fridge out. I learned that they apparently build the campers around the refrigerator and there is exactly enough room to get the fridge out to work on it. Definitely a two person (at least) job.
