BobH..That job sounds like what I refer to as a trap, you stick you foot in the door and it springs to closed position. It's hard to aviod these and you did the right thing with proper documentation. The one I like is when you're called to replace a bad receptacle and " by the way would you check out our basement that was wired by Fred the head, we were not sure he knew what he was doing and want a professional opinion". That's when you have to tell them that the AHJ provides such a service at a very reasonable price and that you can't take responsibility for the work of others. We all make mistakes and I wouldn't let one little service call bother me. I wish I could look back and say I was only on one job where I should not have been or I only lost money on one little job. They are out there and some won't be so obvious . Good Luck in the future.
