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I replaced a R22 condensor. Before evacuating with service valves closed, I pressure tested the lines and coil with 200 psi nitrogen. It dropped a little within 15 minutes. To make a long story short I couldn't isolate the leak, so I cut the lines at the evaporator, brazed a schraeder valve in and put 200 psi on the evap coil to see if it leaked. And while I was at it, I brazed the suction and liquid lines shut at the evaporator so now back at the condensor with the service valves still shut i could pressure test both lines individually with 200 psi. Here is the ball buster part, I went to lunch and came back, nothing dropped. WTF! Why would it drop when everything was connected, but not when eveything was tested individually? thanks in advance