Fair warning, I am really not very familiar with EM logic. I have tried to look at the ipdb schematic, other pictures of the same credit unit relay and it seems that the switch are properly closed or open so I assume the issue may be somewhere else?
When I press the start button, with credit on the credit unit, the Credit Unit reset coil actuate but stay on and does not reset/turn off. I have to switch the power off for it to release.
Mechanically the unit works fine when i press on the coil by hands so the issue seems to be because the coil ground does not disengage and it stays on (W-BLU wire?).