I kegged a batch of beer 6 days ago that had been fermenting for 13 days. I actually overflowed the keg a bit when filling, but made a little room and put about 20 psi on it. I left the keg in the same spot it was fermenting and saw yesterday there was some foam that leaked through the keg lid. There was still just a tad bit of pressure inside, so I added more gas to pressurize. Should I have any reason to worry about infection? Its been a day or two since I noticed, should I open it back up, clean and sanitize the lid and replace or leave as is?