As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) TURBOCHARGER COMPRESSOR BLADE LEADING EDGES SEVERELY ERODED. DURING INVESTIGATION, AN AN363C-362 NUT WITH THE REMAINS OF A SCREW STILL ATTACHED WAS FOUND ON THE TOP OF THE INDUCTION AIR FILTER BETWEEN THE FILTER AND THE TURBOCHARGER.