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I think the superficial layer of the bearing material is not really ferrous and comes in flakes. It's more likely that one of the chain pads is worn down and disintegrated and the chain runs on metal grinding ferrous debris into the engine. I'd pull the sump and take a look at what's inside. Checking cam deviations and actual cam angle are also good ideas to confirm, as suggested by Gilles. You can also listen to bearing noise under the IMS, if it's bad, probably should be audible. But most likely the engine needs to come out if you want these fixed...
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