How many taps are you driving with this tank? Number of manifolds and type? (metal vs. plastic).
If you have several, look at your inline connections and manifolds first, you can dunk these in a nice shallow pan / food storage container and observe for leaks, you'd be amazed how many times what appears to be a properly done connection with a tight Oetiker clamp will spit out small co2 bubbles when dunked even though it passed the soapy water test.
Generally speaking, 90% of CO2 leaks that are NOT related to the tank washer, are located at high failure rate points being connections to tavern head barbs and manifolds.
I would not recommend dunking the regulator, some can handle it, some cannot,. Diaphragm failure is usually notably audible, and tank connections cause most of the problems, if you have a multi gauge regulator, carefully use a pipet to dribble soap water on the gauge connections to the body and watch for bubbles, forget about a spray bottle, it introduces way too many little bubbles. If you have already eliminated every other possibility by soap and dunk test, thoroughly clean the regulator sealing surface, get a brand new nylon or fiber tank washer, really crank down on the nut and try again to see if it holds pressure.
Good Luck!
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