Guys, I appreciate your comments about taking the high road and letting someone else do it. But........this is Alabama and even though I live in the 4th largest city, there is no Cummins-Onan service here with the closest one being Atlanta. Labor rates here running 105/hr and wherever I take it, I may be the "first time ever" for pulling the generator. What should be a 3 hr job, may be a 3 day job due to inexperience and I can't stand that. I also worry about collateral damage, a real thing here when Bubbas have wrenches. I am going to see if any of the 3 RV places in town, listed as full service Onan dealers, have a "flat rate" for generator removal/installation. If so, I may reconsider, if not, I know I am up to the task from a skills/tools standpoint.
Driving to Atlanta brings on its own set of problems, as I think it would be a multi-day repair due to the nature of the part being replaced. That means a motel room for several days or finding a friend who would follow me over, bring me back home, then take me back over, etc. My understanding is that the controller/inverter is a "swap out" with Onan with the old part being returned to them in exchange for a "reconditioned/rebuilt" unit. I can/will call ahead and see if they have one on the shelf, but I doubt it. I've got to get the part number first and have a part's manual on order as we speak. Perhaps they can "pre-order" the part so they'd have one on hand the day I arrive.