[mikehinton]

There are mostly outlets on the circuit. There is one switched overhead lighting fixture. The "gray stuff" I was referring to earlier is the direct burial style of Romex. It's in PVC conduit. I don't think it could be nail damage, since all exposed Romex is in EMT conduit, and there haven't been any construction projects near the circuitry. There is one branch of the circuit that was added later that services a couple of outlets, but that circuit has worked fine for a couple of years. I think I'll disconnect that one first and see what happens. A project for daylight tomorrow...