My VIN: 16BKP37N4P3307675.
As stated in my original post, I do not know why it was disconnected. Without hands-on testing, I cannot say exactly how it was disconnected, nor can I know what is wrong with it. I am a bit leery about the design, I'm convinced it was not one of GM's best ideas. There is also more than one owner who has retrofit the auto park with a linear actuator, which gets rid of the hydraulic cylinder, the RGS, the original pump relay, and off course the pump and reservoir. It eliminates about eight hydraulic leak potentials and greatly simplifies the brake. All this still relies on the drum brake, which is why I insist in giving that a good look ,,, regardless of what else I do. It is nice to know that there are owners out there who have auto parks that they still trust. I also agree with the post that says my foot brake should hold the vehicle well enough so it should be at least obvious it's still on when I attempt to drive away, making the alarm system no essential; but it's never worked that well since I've owned the vehicle.