Well.... It's been an interesting road. I'd like to thank this forum for all the info, support, and help.
Unfortunately, a mouse (or mice) made it's way into the glove compartment area, and did a number on the wiring harnesses.
Even though I just replaced the heater core, as well as the ignition control module and coil pack... and things were looking good. This mouse damage just took all my enthusiasm, energy, and motivation out of me; I just don't have the time and energy to work on Reatta wiring.
Additionally, I believe the insurance payout was very generous... likely more than I would've received from selling the car. So, that was at least, an upside to the story.
I guess I'll proceed in selling off any other Reatta stuff I have...
Bye all.
Good Luck!