On all of my kegs the gas posts have little notches, or an engraved ring around the points of the bolt part to differentiate them.
Back to the leak, I don't remember if you replaced the orings or said they look ok. If you haven't, just replace them. The are cheap. Check the wiki for mcmaster part numbers.
Back to the leak, I don't remember if you replaced the orings or said they look ok. If you haven't, just replace them. The are cheap. Check the wiki for mcmaster part numbers.