There are some very skilled folks on here that should be able to assist. Definitely have a camera ready, a lot of the troubleshooting will require some photos to be taken (solder joints, connectors, battery damage etc...).
I hope you can get it up and running soon, I've got the same machine and it's a blast!
Question: Has yours still got the original Rom Board (upper left corner of backbox just inches above the knocker?). My ROM board had lots of broken solder joints (from knocker vibration) at those connectors.