But the OP reports 17 volts between the neutral and the line downstream of the open breaker. To me that suggests phantom voltage on the ungrounded conductor, not an offset between neutral and ground.
Other than in the title the OP never refers to ground (EGC?) at all.
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I don't know what I was looking at before, I think the title was throwing me off, for some reason I thought he was reading 17 volts between neutral and ground. I don't see it that way now and do suspect phantom voltage is what he has.