Hey Ed, your very knowledgeable. I would suggest calling the dealer to come in and update the software.
I had a truck once that wouldn't reset the code displayed and after I brought the dealer in with the laptop he explained the truck had old software in it and it wasn't supposed to reset after the problem was cured, the laptop had to be used. New software rectified this and allowed the code to clear upon repair of the circuit. It was for the work light relays.
I'm not saying this is your problem but something to think about.

All the best.