Hi Visionman,
Welcome to AP mate..
There were no " service manuals" for these games... manuals for games didnt come out till a few years later.
All Midway gun games are pretty much the same but with a different theme etc... i have 2 in my collection that ive repaired, so if you have any questions, ask away!
Do you have a schematic???
I have scans of 1976 Monster Gun i can send you.... will be exactly the same machine... you can print off and tape together to make a single sheet
