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In the end, Headhunter said the screen was the problem.  They were correct.  The screen was not overly clogged but that was the problem.  The plumbing did not include a union so the Pex had to be cut out and replaced.  From a Newell maintenance point of view, that may not cost much more than working with a union.  Also, the screen was mounted backwards, not sure what difference that makes.  Motorhomes of Texas was the last one in there.  Newell is absolved.  The flushing difference with a clean screen is amazing.

Glad you hopefully found your problem!

I just reread the thread and I am not seeing the location of this screen? Can you enlighten us where that screen resides? I would assume it’s either on the input or the output of the pump. Is it also worth adding a union for future maintenance? 

Thanks again Jim for your documentation!