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Hm, looks like something hard did get sucked through the scavenger pump. Doesn't look like a normal wear pattern. That could have blocked the pump and things happened. The question is what got sucked into the pump? In my opinion, it must have been something hard like metal.
The IMS bearing is completely intact? No single bearing ball is missing?
Were you able to identify where the metal parts in post #4 came from?
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