I'm hoping for a little kick in the butt here! My right slingshot kicker is not working. I have replaced the proper mosfet on the driver board. It was tested as bad. Also replaced the op amp at u1. Inline fuse is fine had continuity. 72v D.C. On both legs of the solenoid. The 2 switches check out fine at the slingshot as well. Any ideas what I missed?