This letter explains why we can't find manuals for these machines for online review.
Here is where you can get a manual according to the letter:
"...genuine documentation bearing
the Gottlieb Marks is available for purchase from Steve Young of The
Pinball Resource, 8 Commerce Street, Poughkeepsie, New York 12603
(telephone: 845-473-7114; fax: 845-473- 7116; email:
email@example.com). They are our official distributor of genuine
Gottlieb spare parts and documentation for North America. ..."
I would love to help but I can't find a manual - unless I buy one.
I'm hoping someone with more experience weighs in with better information.