http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=v6maint&Number=838883&page=0&view=collapsed&sb=5&o=7&fpart=1 If you don't mind a DIY job, then check out the link.. much cheaper route..
IF you are opposed to replacing it yourself (3 hours, and collection of tools), or just don't WANT to, then that is a smart idea to have them do it.
Ray