The one I did was sort of a "Okay, let's go humor them", never expecting to be able to replicate the claim. Put the meter on the tub drain and got 66 volts! Bathroom butted up against the kitchen wall, behind the stove. Was expecting some kind of grounding back feeding who knows what... but was surprised to see the drain pipe was PVC. We replaced the stove receptacle and the problem went away. Over time I saw lots of "energized lumber" in those apartment buildings. Unsettling to touch a voltage sensor to exposed 2x4's in the attic and have it go off.
