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Just thought I'd post up what appears to be the resolution to this problem. Took the car into the local GM dealership today and had them do a brake pedal position sensor recalibration with their tech II. No more stability system/service vehicle soon warnings. The traction control light is out on the dash now and I have full functionality of my traction control button on the steering wheel. The only other thing that I haven't tested and confirmed working yet is my cruise control but I have high confidence that this will be resolved as well. Thanks to everyone who chimed in and offered advise.