Gotta be RCM or Brake Controller. I can't see where else we can go with this.
One thing, (it's a long thread) - coupe or roadster? See, Roadsters whose top won't go up/down combined with a wing that has it's own mind points to CLP/SSM or brake controller.
The coupe is a pain, cause we have no convertible top to test with. Fact is, a top that won't move can be a problem, but it also can be a diagnostic tool, one that is denied us in the coupe.

To restate it: Not EVERY thing wrong with the car is a separate failure, sometimes, additional failed items/features are CLUES to what is going on.