I set up my kegerator with a 4-way manifold for the CO2. When I attached the gas lines, I sprayed everything with starsan, and couldn't find any bubbling anywhere. I tried another test after: I left one of the valves on the manifold open. I disconnected that line from the keg. I shut off the valve at the regulator's out-point, and left it that way for a night. The next day I opened that valve. The needle on the regulator dropped for a split second, from 13PSI to 11, and returned back to its place right after. Does this indicate that I have a leak that might cost me in the long run? Are there any other ways to check for tiny leaks?