I would be back at the dealership with receipt in hand . Find the same sevice advisor who did your original write up . Calmly explain situation to him and your expectation of a new replacement at no cost . Shit happens sometimes and if the service advisor can not solve it calmly ask for the service manager . If you do not get satisfaction ask for dealer GM. If they are worth being at they will resolve it. If no satisfaction document it with pictures and file complaint with the motor company in Milwaukee