That switch stack on the credit wheel unit is all screwed up. This is not a score reel issue. It keeps starting a new game like you're pressing the credit button. I think this is the unit:
http://www.planetarypinball.com/reference/partsmanuals/WMS_Parts_1966/files/mobile/index.html#11
While it's kachunking, pull apart that switch stack that's all crammed together and see if it stops...