Well, it ended up being the thermostat. It was replaced and the fridge is getting cold again.

I ended up tossing everything in the fridge, from salad to mayo. I do not want to risk any food poisoning. I even tossed a few extra things from the freezer. Hubby said, "Oh, the chorizo wasn't frozen anymore, but I put it in the garage freezer" and if that had time to thaw, then plenty of other things did too, I'm afraid.

All told, I only lost about $100 worth of stuff. It could have been worse. We could have not noticed it at all (or been out of town) and had to get rid of everything.

I'm just really annoyed since our fridge was purchased the day we moved into our house - Dec 29, 2004. It isn't old enough to start breaking!