I got an offer for a 5 year old danby kegerator. I know it has problems including temperature control as the owner says the thermostate only gets down to 55 degrees and then turns off. Not sure if it is problems with temp controller or with the freon. He is pricing this to me for around $75 and includes everything. I would buy a controller II temp controller and mount some fans. Thought on this? How long to the compressors usually last 5, 10 20 years?