Well I'm hearing that all studs and warped manifolds are not replaced when an exhaust leak is discovered.
A warped manifold will not seal properly with new gasket and bolts.
Make sure you talk to the technician or shop manager to incourage that the proper repair would be to check surface of manifold, surface grind, or replace if warped. When one or two studs/ bolts snap off, it puts stress on the next studs on the manifold. Insure all studs/bolts are replaced, including the manifold flange bolts and nuts. If your dealer does not do this quality level of work, find another shop!!
I have had both sides replaced on my truck under warranty. I have double checked my paper work and all studs were replaced along with a new gasket. Manifold was not replaced or surfaced grinded. I do know that this repair was done as soon as I first herd the leak. That alone would of reduced the warpage on the manifold. I hope the $150. an hour technician would of checked for warpage on any manifold leak..