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My theory is that the little chain guide dropped down onto the chain, still trapped on top of it and the chain would just wear away at it. I get the fine fibres... good news trapped at the filter.
You could stick a borescope in the drain plug hole and maybe see what's at the screen or bottom of the pan. That screen is rather coarse compared to filter.... keeps the big pieces out. You may even see a bit of residue in your drain pan??
You could stick a borescope in the drain plug hole and maybe see what's at the screen or bottom of the pan. That screen is rather coarse compared to filter.... keeps the big pieces out. You may even see a bit of residue in your drain pan??