Mark, if the bottle read 42f at the top of your keg that means the beer in your lines and coupler at the top of the keg is at 42 as well... I'm wondering if that is your whole problem to begin with... Have you checked your door seals to be sure you have a tight system?
Semper Fi,
The Gunns
"Beer is proof that god loves us and wants us to be happy" - Benjamin Franklin
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