You are heading in the right direction. Having owned the car for only a year I would question the condition of the battery. The Crossfire is very critical of battery condition. The first sign of a battery going bad is often the deployment of the wing for no reason. If there is any doubt as to the condition of the battery I would replace it.
Did you purchase the car with some of these malfunctions, or did they just recently appear?
If you still have the RCM which was removed from the car you can send it to tighed1. You can email him at tighed1@hotmail.com He will refurbish the RCM and return it to you for a very reasonable fee and the horn will function when ever you push the center of the steering wheel, not just when the ignition is on. I assume the RCM that is in the car now is brand new? It wasn't taken from another car used?
You probably have more than one problem. WHERE IS THE CAR NORMALLY PARKED? Could a rodent get to it and chew on some wires? If you have any doubt about the cars battery get a new one.