I've just now put my Xmas brew in the shed to cold condition( APA), and thought I would draw one off just to check pressure. But no beer so undone the lid and no hiss! I've got a top tap keg. I then put some gas in and could hear it escaping though the lid. I've now tightened it. But the beer is flat. So do I bring back in the house and reprime or just leave alone with 2 x 8g co2 capsules in there?