Richard,

Somewhere in this process you probably signed some sort of written
contract, perhaps called a work order. There's probably some langauge in
that contract about warranties. My guess is that you are liable for the cost
of the parts and labor to install the risers and manifolds and they are
obligated to deliver to you a working boat. If they blew the diagnosis then
they should eat extra cost to make your boat run.

Dave M.