Point Pleasant, NJ
Did you verify the new coil is wired correctly? Brown wire should be on the banded side of the diode according to the schematic.
I think you may have missed the other pdf for the schematics over at ipdb.org. I guess they made a separate document for higher res photos or whatever. Here's the link to the pdf:
Go to page 55, "CPU schematic page 3 of 4" and you'll find the rest of the solenoid circuit on the cpu board. Note there's a resistor pack between the driver and predriver that may be faulty as well.
These problems can be hard to tackle on DE games for whatever reason. I'd do all transistors and diodes in that circuit and the resistor pack for good measure if i were to try to shotgun the repair. It sucks because if you don't replace all the bad parts at the same time, the remaining bad ones can sometimes knock out the new ones you just installed. 
That's probably about all i can do, but hopefully this will get one of the more seasoned techs' attention so they can properly help troubleshoot this. Good luck!
