Did you ever get this resolved?
I just got a PZ too. A friend was telling me about how difficult it can be to adjust that switch behind the back of the playfield there on the Ozone ramp. But then he reminded me/himself that you can reach some of it by going through the neck of the game when the backbox is down. You know what I mean? Like have the backbox folded down gently onto the playfield (with a towel or something underneath to protect your side armor from getting banged up) as you would for shipping (keep the legs on obviously). Then you can use the openings that the big wire bunches go through to access that back switch. That seems like a better way to attempt adjustments than pulling the entire PF out.