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If the Guardian says that your engine is shedding ferrous material, that is all that you need to know. Stop. Flatbed. Get it to an engine internals expert and determine the cause. You don't care which of the failure modes is triggering the diagnosis at that point. Because of the warning, you may be able to stop the rotation in time to save the engine from getting little pieces all through the smaller oil passages and thus making the engine a scrap candidate or a complete rebuild candidate ... both of which are perhaps beyond the financial willingness of most. Where the single failure repair might be in time to save the engine and be financially affordable.
A diagnostic test that detected only the IMS failure could leave the engine exposed to the other failure modes some of which could lead to things that could be detected but not by a test for only one thing.
If you are thinking vibration analysis, I know several people who tried it. May you have better luck than they had.
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