Could it be possible you are missing what I said in a prior post, re-read it. A General Motors employee told them to get it in to look at that button on the steering wheel. This isn't the dealer doing a fishing expedition on their own, the manufacturer has been in communication with them and the day I posted a GM service rep in person at the dealership told them to get the Yukon back in and evaluate and likely replace that switch. You can go on all day long about a bulletin but does that mean it is impossible for engineering to communicate with their staff internally to look at options in the field when they have a vehicle which exhibits this issue nearly 100% of the time?
Cool your jets boys. My point still stands, I don't see this fixing it and only accumulating more days down but again, this next visit is at manufacturers request so we will give it a try.