Just got my truck back with the new revised rear window.
After several more calls and a trip back to the dealer, GM agreed to cover the repair 100%.
GMC Product Assistance Claims department had the local dealer complete a “proprietary and confidential inspection.” The inspection took two business days and the dealer was unable to provide any additional details. When I picked my vehicle up from the inspection I was given no paperwork. I signed no documents and have no record my truck was ever even in the shop. A day or so later, I was informed by PAC representative that the inspection found no defective parts or faulty equipment, but GM has decided as a one time courtesy to cover the repair costs for customer satisfaction.