As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TURBOCHARGER RECEIVED IN FOR INSPECTION. FOUND THE TURBINE HOUSING HAD DEVELOPED A GROWTH OR DEFORMITY IN THE CASTING. THIS DECREASED THE CLEARANCE BETWEEN THE TURBINE HOUSING AND TURBINE WHEEL CAUSING A SLIGHT RUB OR CLUNKING SOUND. REPLACED THE TURBINE HOUSING AND LOCKING HARDWARE IAW CURRENT TECH DATA.