wet area - shock from switch cover screw
Neighbor is getting shocked (not static) from switch plate screws in the bathroom after a remodel (they touched the light switch while standing barefooted). It's a 40's house with BX cable, plus some other remodeling work done by a "house flipper". There was evidence of improper wiring done by that owner that has already been corrected (found in the bathroom ceiling near the half-witted install of a non-working vent fan).
As for this energized switch (and two others in the adjacent room), the electician says the boxes (metal) are grounded, but that he suspects the neutral and ground were co-mingled or misconnected somewhere when they did the work. He says that it's hard to find, and that it would be wiser to pull new wire for the circuit. Are there other ways to fix this without opening walls, etc? (He says not.) Thanks much.