Well it seems the bolt was missing from the suspension self leveling linkage.
Rode it home, 20 miles perfect.
Rode it later in the days on a 20 mile trip. Perfect.
Rode i 20 miles home, but after 10 miles or so, one up, on the freeway, it threw code C210A (suspension fault again). Oh bummer.
So it will have to go back. My guess it perhaps is not calibrated correctly, or the pump has issues or there is an air leak. Or it was a Wednesday.
I don't know. Now I'm getting a little, how shall we say, less forgiving.
Back it goes I gvuess.