Hello, and thanks for taking some time to hear my trouble! I had new motor mounts and lower oil pan with new gasket installed, on 2016 Silverado 1500, got it back and there is a faint grinding sound after a cold start on acceleration that goes away when it's warmed up. I had to take it back because, get this, a bolt was missing mounting the motor mount to the frame, they made an "adjustment" and the noise got better for a day, now is back and more prominent than before, still faint, and still goes away as the truck warms up.

Any insight before heading back to the shop with it would be greatly appreciated, thanks in advance!