Just wanted to update the issue I had posted. Basically, I had a throttle dead stick. It turned out to be the TPC on the back of the MCX engine (now replaced) and a short in the throttle by wire system. Both were repaired and we are back on the water. I can't say enough good things about Ski Boats Unlimited in Chesapeake, VA. They diagnosed the issue and repaired it and got us going. BZ to them!
(That's "good job" in Navy speak)