I have a Beverage Air BM23 that is not cooling properly. When I first plug it in, it cools properly and then within a day gets up to 55-60 degrees. Could this be just caused by being low on freon? Can anyone tell me how to charge it? I did see that it uses R134 and not R12. I am trying to find a serive company in the Denver area, but thought I might try to charge it myself if possible. I was told be a refrigerator repairman that it is a sealed unit and will likely require compenent replacement. Any information that can be provided would be greatly appreciated. I want to get back to drinking cold beer from it again soon!