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Hopefully Matty can help here but I would look for shaft play of the turbine, condition of fins on turbine making sure they don't have chips out of them and the shaft doesn't move side to side too much.
Check the inlet where the fins are to see if any scratches on wall and check if any signs of oil leakage around turbo compressor housing.
Check for cracks on IC and just general condition checks, etc.
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