Alright, more info.
2013 with TCS / ABS / Service Advanctrac message. Was taken in for diagnosis. As per the flow chart, RR Wheel Speed Sensor was ordered. Sensor was installed last Sat, lights still on, dealership was unable to further diagnose on a weekend. The car is going back in today.
While changing my winters over, I noticed that the lower color keyed trim on the passenger side just behind the front wheel, and the shroud around the wheel are bowed out. My guess is that part of the shroud was disconnected, and then bent backwards without properly removing it. Besides this issue, no one but me has touched the car, and I'm very meticulous when it comes to washing and maintenance.
I obviously can't blame the dealership unless I can determine a reason the technician may have pulled that shroud back. I was thinking maybe to access the ecm or abs module, but both of those are up front. Is anything else back there? Or do I need to look for another cause?