The 5v voltage drop on my tz was 0.12 between the touch point and the MPU. Pin wiki says 0.1v is ok, Andy suggested 0.04 was right.
By removing the z connector and soldering the wires directly together (pinwiki suggestion) and cleaning pins, pushing the wires back in the connectors with the right tool, I have got down to a 0.07v drop
I have pressed the flippers like a demented fool, played a dozen games and could not trigger a reboot. If I get another reboot, I will go further with the repair but I try to avoid removing boards as the potential for unsettling something/ breaking a connection somewhere is always there
It made me wonder how my other games were. Addams as ever has been a fantastically reliable game over 15 years. Registering a 0.01 drop. Shadow 0.04