Talk to Phoenix about the southco latch. Mine broke also, and they sent me a new one without cost. 2nd one appears to be better quality. The refrig is something else. Probably needs to be serviced by dealer, as much more complicated, and who knows... One could purchase the wrong part, and still not have a working unit.
I did talk to Phoenix about the screen latch. They said that it is a continuing problem and their the only one that carries that particular latch. I had to buy it (12.50 + freight), no way was see going to give me one to fix the problem. That's ok, I can live with that.
Reference the Frig problem: It looks to be a program board, I think. It's at a RV repair shop to be fixed. If I had to replace the frig, I'd go with the Dometic brand, never had a problem before.
On the positive side, after talking to Phoenix and Norcold on the phone, they were very polite and friendly.