If you don't mind a little driving, Scott Chevrolet off the 10 in El Monte is the ticket.
They have a great staff in their service department and service more Vettes than any other dealer that I know of in this part of the world. I know quite a few of the guys there and they all try to make everything right with your pride and joy.
They are also quite liberal and try to keep the inconvience at a minum. Like loaner cars if they have to keep your car over about a half a day.
I'm not their marketing department, just a satisfied customer!