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I have a TDD-2 Keg cooler that is about 8 or 9 years old I believe. I got it used 2 years ago. When I first got it, after initial cooling, it would run about 6 minutes and be off for about 12. Not sure about beer temp, but internal temp would bounce between 34 and 40. For the past few weeks, the cycle has been crazy. It runs for 40-50 minutes, and is off the same. I just checked a water bottle liquid temp and it was 31.5 degrees. and the beer lines are freezing at the top of the tower where the bend in the steel line is. Is this just a thermostat problem, or is there more possibilities?