New guy...9 months on the job after tech school. 43 yrs old, very serious about being a good tech. I thought finding leaks would be as simple as waving my magic leak detector around and spraying some bubble soap all over the place. WTF? Where have I gone wrong? Time after after time I show up on a service call...add some gas...look for a leak...find nothing. More experienced tech follows up on my call and finds a leak. What is the secret?