longspoon, did you ever resolve your problem? I'm having all the exact problems on my 05 roadster, manual trans, 22,000 miles. I have the same warning lights. spoiler stuck in up position with the red light flashing on it's switch, speedo not working. This all happened last night at the same time. After I got home, I cut the car off and restarted it. It then had a check engine light added to the mix. After sitting all night, when I started it this morning, all the lights were gone and I was able to put the spoiler down with the switch. As I was going down the drive for a test drive, all the above happened again when I applied the brakes. This afternoon all the lights are still on when I start the car.