So I woke this morning to a puddle under my fridge in the garage. The culprit was readily apparent - a leak at the liquid out post/Black QDC connection. So, I disconnected it for the day to see if the leak was a result of the post itself or the poppet - not the problem, no leak at all, so I put a new o ring on the post and hooked it up with a new QDC. The slow leak was still there at the base of the QDC and the base of the post...argh! I now am resigned to buy a new liquid post, but it seems odd that the post isn't sealing with the QDC despite a new o ring and QDC on the beer line. For what it's worth, this is a Cornelius Super Champion with pretty slim looking keg posts compared to all of my other kegs. Any thoughts or helpful hints on this? I may have to retire this guy if a new post doesn't fix the issue.