It's a mystery really. No one at Piega wants to give any answers, but I would not assume you are without warranty. The guys at Piega are the real deal, and I don't see them hanging anyone out to dry.
As far as the COST of warranty service, it may be prohibitive for us on the wrong side of the pond. Then again, I know a ton of people with Piegas, and none have had issues unless they did something stupid like POURING Walker SST on the binding posts. LOL!