James,
Have you tried the Better Business Bureau?  If they have a clean record there,
the shop may want to cooperate.  If the shop already has unresolved complaints
you may not get anywhere, cuz they don't care about their BBB rating or
reputation.

Your best bet is to try and resolve this with them.  You are better off if you
can negotiate and get part of your money back, than going to court and then
trying to collect.  Don't be afraid of telling the shop what you expect from
them.  If you can't do it in person, put it in writing, and demand a response.

Laws vary from state to state, but my experience in small claims taught me
that even if you win, you may not be able to collect.  Small claims is not
free.  You pay a filing fee, and then a fee to have the other party served if
they refuse the registered letter.  If you win, you need to file to have their
wages garnished, or property seized, because chances are they won't just hand
you the money.

You still need to present a good case in court.  How do you plan on refuting
the shops claims?  You need a statement from another mechanic (much better  if
you have more than one opinion) to back up your side, or better yet, you need
the mechanic to come to court with you.

Good luck and let us know how it works out.

Steve
'74 Campmobile
SKL Enterprises
Importing German Side Tents and Accessories for Bus, Vanagon and Eurovan and
Carver Propane Heaters
http://members.aol.com/tentinfo