[...] He downloaded the logs remotely, and found that the air suspension had gotten stuck in "Extreme High". (He then said "I didn't know there was an extreme high.") He already had the problem description which I'd already given.
He had me test the suspension adjustments, which are currently working.
Then he ended up telling me that
(1) he was referring the problem to engineering;
(2) it was almost certainly a software problem, not a hardware problem
(3) the car was definitely safe to drive even if it happened again, and I wouldn't be doing any damage to the system
(4) to call if it happened again.