Ok, thanks very much to @ScottV for his comment on another thread about this. I disassembled the car as he suggested and for some reason I don’t quite understand, one of the gears in the door had jammed. Taking it apart and CAREFULLY putting it back together fixed the problem. Very cool car but finicky. Here is what is looks like inside.
Moderators, I’m going to leave this thread as it might help someone in the future but of course fine to delete if that is better. Thanks!