Definitely contact GM: I had an issue with my dealership not doing enough research on my radiator leaking. They missed the spot where it says “speciality coverage” so they tried to charge me $800 for a new radiator. I gave them the speciality coverage bulletin and they confirmed with GM. Radiator was replaced under warranty. I contacted GM about this saying, if I didn’t do my own research I’d be out $800. Remove me from the equation and put someone in who doesn’t live on a forum and truck groups, they’d have no idea about how to find special coverage items and would’ve thrown $800 down the drain. GM made it worth my time with a healthy gift card for accessories. Be a squeaky wheel but tactfully, being an d*ck never pans out. Waterfowler 41’s Youtube channel: https://www.youtube.com/user/brittmork