Has anyone had a rash of leaky evap coils? Ive had 3 in the last day and a half, leak detector goes off but cant make any bubbles show up to pinpoint the leak, the leaks have all been where the copper u bends go through the steel ends on the evap. The leaks are down on the last 2 bends, the last two units were 2005, one amana and one bryant/payne, the other brand I forgot, one was low a pound and a half the others were low by 3 to 4 pounds all were charged last year by a different contractor who "didnt know how to leak check" or didnt have a leak checker? Not sure why he couldnt have used some of the homeowners dish soap with some water but good thing is I picked up the job they didnt call the last contractor back. Most times I find the leak on the cap tubes in the evap from not being zip tied together or from the zip tie breaking allowing the cap tubes to rub. Lately though all have been where the copper goes through the steel.