Just had my unit up front replaced. Tech said they don't have a port to add freon and that braising/soldering in a port requires torch within inches of foam insulation. He said he wouldn't take the risk of fire for any amount of money. It took him less than an hour to replace unit and I found several a dealers within a hundred miles (and I am in the middle of RV nowhere land -- only one dealer within 50 miles and most are 70-80 in opposite directions)