If anyone has some suggestions as to what's going on with my kegerator I would greatly appreciate it. I converted a chest freezer to a 4 tap kegerator about 3 years ago and it has worked flawlessly until a few weeks ago. I purchased a 4 keg secondary regulator panel from micromatic (each has its own separate gauge), which worked great until recently. Essentially, 3 of the 4 regulators work fine, but the 2nd one from the left no longer lets Co2 flow through it. Anything I can do to test that individual regulator to see if there is something in it to fix? I'm sure its not the ball lock gas fitting that connects on the in side of the corny keg as I replaced that. There is a black pin on the underside of that fitting and on the regulators that work, a brief shot of CO2 is dispensed if you manually push it in, but no CO2 release on the suspect regulator.