UPDATE!
I ended up pulling the RV from TAG. I couldn't take getting jerked around by them any longer. I told them I had plans to go somewhere in it and needed to pick it up at the close of business on a Friday. When I showed up 15 minutes till close they had the nose piece off the RV, AC hoses dangling inside and nobody working on it. I almost lost my mind! I pulled my wrenches out of the RV and started putting it back together myself. They had someone start helping me and tried to get me to buy the $700 service part they had purchased. But when I looked at it I knew there was no way it would have fit my system. It was about 2x the size of the space I knew it had to fit. I told them I would think about it and drove off. I then had an independent diesel mechanic experienced in AC work look into it. Since TAG had opened the system, he had to replace some small components, a few o-rings and inspected everything so he could charge the system and look for a leak. He found no leak, but did find that the belt for the AC compressor was missing! He replaced the belt and air has worked like a charm since. I taped up the cracks in the plastic housing with gorilla tape and have had no issues whatsoever. (Knocking very hard on every piece of wood within reach...) I waited several weeks and then stopped back by TAG after I was sure there were no other issues or leaks. How can I say this nicely???? Well I wanted to be sure they had a full understanding of the situation and my level of dissatisfaction. I think they do. I'm actually thinking of taking them to small claims court to recover what they charged me.