What is the room temp and does the foam go away at all if you pour several glasses back to back? In my experience, keeping the tower cool is the only way to get rid of foam problems. My tower isn't cooled, but I've found that if I pour about 1-2 seconds worth of beer into a trash cup just to get the warm beer out of the lines, the foam is greatly reduced.
Also, you said that it was a used kegerator...when was the last time the lines were cleaned?
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