Another option, do you know anyone who works in the Aerospace Industry/ Airport/ Maintenance?
All gas turbines have their oil sampled and analysed to monitor for component breakdown. These guys can determine from the smallest partical what a metal is composed of. (And by extension which component is failing inside the engine)
If you've got any contacts there's an avenue you could go down.
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Sir Humphey Appleby, GCB, KBE, MVO and MA. Britain's Greatest Orator, well bar that Churchill fellow.
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