I emailed Godin and am very disappointed in their reply:
That model was discontinued in the late 80's, and we unfortunately no longer have replacement parts. My guess is that the problem is caused by the battery connector. Make sure it's properly soldered, and also change the battery.
Support Clients / Customer Support
Guitares Godin / Godin Guitars
I would have thought that any pro company that no longer supports their products would at least offer advice or the schematic for repair.
Also think that the smart a$$ answer about the battery is disrespectful as I explained that this bass was a gift to one of there earlier dealers that owned a repair shop.