An opinion poll---
Some times a customer loses a portion of a ckt. due to an open connection somewhere. It can be tedious enough tracing it to a poorly connected device. However, in the past few months, I have had broken circuits in what must be buried JBs("the carpenter did the electric"). In one case of a broken hot, I used the neutral to ID the circuit at the panel. After removing the hot from the breaker, and attaching an note, I re-fed the circuit at a convenient point. If the bad connection was in the middle of a circuit, the first few outlets would not work, but everything came up. If, for some reason the bad connection "re-attaches" itself, the disconnected hot at the panel will become hot, but I didn't know what else to do.
A few months later someone else called with the same problem, but before I could get there, someone else came out. The customer told me that "after taking a bunch of outlets apart, He couldn't find anything, so he had to run a new wire".

Any thoughts on this solution?