On my kegerator, I hooked up a keg and it worked fine for five days. Came back three days later and no beer will come out of tap. Have pressure, have beer in keg, line is not frozen (happened to me once when someone we wont mention left door ajar). I pull the tap and get a drip. Can anyone help me? Could the actual tap be broken? How would you fix that? Thanks in advance, I have half a keg of two roads that I do not want to lose.