I must have a CO2 leak. I have a summit dual tap kegerator. One tap with Yeungling works fine, but whenever I connec the second keg and turn it on I run out of CO2 during that evening. Where is the most likely point for a CO21 leak to occur. Currently the second sixth is Michelob Ultra which was tapped last night. Any thoughts? Please advise

Want to be able to dispense both kegs as my wife doesn't like any non-light beers.