I'm deep into it now. Am about to get a long stick and press the brake looking for 12v applied. While I am in the trunk, I have removed the right side felt interior panel to allow me to remove the Styrofoam under the rear flat panel to inspect for any water or signs thereof. I am happy to report that I saw no signs of water intrusion and inside a soft foam box I saw a large electronic component that was inside of a ziplock food storage bag as well as a cigarette pack sized component in the fender well area near the rear side marker light. If I ever get these interior pieces back into their proper locations, I'll be amazed. The third brake light assembly in the coupe hatchback is now accessible to remove and perform a voltage test. Wish me luck.