Thanks for the replies! I was getting afraid I would have to go this repair on my own!
These machines aren't necessarily very complex but there are lots of wires and I'd hate to start messing with something that wasn't broke in the first place!
A copy of the schematics would be great! I had a spare coinco coin mechanism that I swapped in but got the same results. I also tried unsuccessfully to rig my machine for free vend. Based on these results I cleared my existing coin mechanism as the culprit. Is there something else I should try / check?
Thanks again for taking the time to help!
York!