I bought a new danby 4.4 fridge for kegerator (tower). Drilled hole in top for beer lines and in side for co2. Sealed them pretty good. Now the fridge wont go below 55. It worked fine for a couple weeks before i put holes in it. Do u think there is something wrong with the fridge? Or can it be some sorta pressure problem if i didnt seal holes good enough? All coolant lines are at the back.