The body control module has control over numerous electrical components inside and around the vehicle, antilock brake controller, windows, wipers etc including the dash panel and the spoiler operation.
This is shown on page 8E-72 and 8W-45-2 to 8W-45-6 of the manual.
The module is located under the hood in that plastic container with the sliding latches.
Maybe all it needs is to have the connectors to it jiggled a bit to get a good connection, that is a cheap fix and always worth a try.

Failing that give the tires a good kick, it will at least make you feel better. You must feel like doing this to the service manager but you might find yourself wearing bracelets. Stick to kicking the tires.

You can find the manual at; http://homepage.mac.com/gregmeach/XFire/

This may or not help but we tried. Has anyone mentioned this module at the dealerships you have gone to?