As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) HIGH PRESSURE TURBINE WHEEL TO HIGH PRESSURE STUB SHAFT ATTACHMENT NUTS WERE INCORRECT PART NUMBER. THE NUTS FITTED (ST3066-11) WERE NOT AN APPROVED ALTERNATE PART NUMBER. THE NUTSHAD BEEN FITTED AT THE LAST ENGINE HSI. PERSONNEL/MAINTENANCE ERROR. UNAPPROVED PART.