Here is what Cummins Rocky Mountain/Coach Care in Avondale, AZ found & said.
Dirty Gen brushes caused the PCboard to fail.
Repair quote was $224.60 + Tax for parts & almost $900 for labor.
I said no thanks since I figured I could R&R the Genset & replace the brushes & PCboard a lot cheaper than their $900 labor.
Thanks to all for your replies
Mike, Wendy & Gordon our Yellow Lab
2015 Tiffin Allegro 31SA - Toad 1973 Yellow VW Beetle
Retired National Park Ranger