We all love the grumpy folks down at SSS Automotive don't we
They hate engine warranty claims, but are always great with small (costly) parts, like ingnitors and stuff. Turbo's and engines you have no chance, and they will win until it becomes a court/dft case.
If I were you, I wouldn't bother, seriously... It's more trouble then what its worth. In my opinion anyhow.
Rebuild it and gain another 50HP and another 10 years life (maybe for some of us? ok... our mothers driving?

)