DK about Yanmar. They've never had a reputation for owning up to problems, but we've filed a claim under "latent defect". It's been determined that it was caused by a faulty valve guide. We recently authorized the insurance company to have metalugic testing done, and are waiting to see if they'll cover. I'd have to imagine if the tests come back showing a problem the insurance company would then have cause (and they have the resources) to persue a claim against Yanmar. Make a note to PM me in a few weeks and I'll let you know how things are progressing.