So...
As I was leaving my hotel room, I checked the back tire on my bike. It was flat. I knew I had had a slow leak, but I guess the inner tube finally just burst. After checking Google, I found a Brompton dealer in Decatur which was just off of the MARTA. So, I brought it out there. They were slammed today with other repairs so I had to leave it overnight, but since I wasn't really planning on riding it tonight that was OK. I should be done by Noon tomorrow, and I'll just head back out there to pick it up. I would have changed it myself, but since it was the rear tire, that would require dealing with the gear hub, and I'm not feeling that "brave" yet.