OK, I figured it out! I started off with RTFM…(Read The Friggin Manual) and after re-adjusting ALL of the nuts and bolts, I went to an Engineering to Layman’s English dictionary to find out the true meaning of “tight, but not TOO tight” and “loose, but not TOO loose” and while I was scratching my head interpreting those instructions I poked around at the connections, first at the XZ-Motor control. I followed that back to the Longboard Control Box and lo and behold, there it was! One of the lead wires had become loose in its plug. Situation resolved.
Moral of the story, when Andy says to check ALL of the connections for firm and tightness, do it! (But not TOO tight and not TOO firm)