[kern417]

Yep. Like I said, all the facts are there and have been presented. Standard warranty claims are never based on labor and parts. Whoever owns the failed part/process, owns the labor to repair too. That's the primary reason why special tools are designed. It reduces warranty spend by reducing time to replace components that fail often. Making it easier for a technicians is just an additional benefit.

But it's up to the other commenters whether they feel like believing that or not. The OEMs still know they have the upper hand in making that call and no doubt it can be difficult to have them uphold what's right. But that doesn't make what they're doing, right. Like in the OP's case, just looking at anything attached to the engine and claiming it caused it to blow up is very, very wrong.