Interesting and very helpful. I'm curious as to where you found the first schematic?
So, relay #7 is what "enables" the internal solenoid signals?
What's the point of grounding the NC contacts?
The final destination for the SIGO signals at least on my arm is the X111 connector.
Its a male JST connector with female pins. I believe it takes a YLR-08V or YLR-08VF female connector with male pins (SYM-41T-P0.5A)
I'll confirm that when I get things terminated.