Message from an old mechanic to the manufacturers. Most of the people who came to me would have probably sold the car before they brought them back to your dealership.
Obviously from YOUR perspective, YOU would just love to make that impossible even thought your dealer network is INCAPABLE of repairing the cars they sell. That's why I was asked to try to fix it after it went to two different dealerships, who, after spending hundreds of dollars that did nothing to address the described symptoms, drove the unfortunate customer to me as last resort, even with all of the service bulletin recommendations that address your poor initial design.
But then I'm just a dumb old grease monkey. Coincidentally one of your own who was the person they brought all of their squeaks, rattles and other defects, to repair according to YOUR time allowances, when I worked for you.
You long ago forgot how to fix my current car, probably haven't touched one in at least 15 years.
regards
mech