Byron,
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If I'm still getting voltage I'm just going to tell the owner to call someone else.
Why lumber someone else with this problem?.
You are Johhny on the spot, you should be able to work this out for yourself.
As far as the Owners comments about "this has been going on for about a year" go, I think it is just rubbish, no way would an installation in my opinion sustain a fault like this over a period of time, without some sort of burning occuring.
As has been mentioned in the Chat rooms here, look to get the place shut off during the weekend, there is no such thing as "Can't turn the power off!".
You need to systematically track and and trace all of the neutral conductors, to make sure that there is nothing amiss.
Get an extra guy if you have to.
A lot of my time is taken up with investigating fires of Electrical origin.
If this place goes up, you could be looking at man-slaughter charges through in-action.
Just bear that in mind.
Just my $0.02 worth. [Linked Image]