Open the outside access panel and look at the coils. I suspect you will find a yellowish powder. If so, your cooling unit is toast. Luckily if thats the case its a fairly easy DIY fix. Look online for Amish cooling unit, buy one. When you get it, watch Utube videos, read the insteuctions throroughly and go for it. It may take two people to get the refer off the wall and face down. But it can usually be done without taking the refer out of the trailer.
If you do not smell ammonia or see a yellowish powder, check 12VDC at the board. When you press themon button do things light up?
How far south?