For my first lager, I pressurized the keg with 20 psi, and left it at about 35F for the last couple of months, and at that time it tasted pretty good. However, I went to draw my first glass of it yesterday and realized the lid had come unsealed at some point during the lagering process. After re-pressurizing and filling two glasses, the beer tastes extremely yeasty. I am wondering if I'm screwed. I suppose it could just be that the dip tube is sucking up the yeast from the bottom of the keg, but I have never had a beer taste so much like yeast, even when the yeast is in suspension.