Sorry if I've missed something Farmersti. What year is your 350? Obviously this depends if it falls within the specified coverage of the warranty. Unless there has been some sort of legal intervention before the expiry of the warranty, I'm guessing it's more or less the same in the UK.
I'd also be going to say check out http://www.350z-tech.com, doing a search on the issues, printing a few out, and taking them into the dealer. These are all known issues.
Sigh........ been there, still going through it mate, so I understand how you feel.