During our trip two weeks ago I got a warning on the TFT that the brake light was not working... At the next stop I asked my wife and she said it was working fine. I tried with just the front and just the rear and it was working... No issues since. Yesterday I was resetting our service reminders with the GS 911 and I did an auto scan to see if it picked up any problems. There was a code for "Rear Brake Light Switch OPEN" but it said it was currently not valid.
I cleared the codes and will see if it comes back.