As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
195 HOURS AFTER INSTALLING OVERHAULED NR 6 TURBINE BEARING, BEARING WAS REMOVED FORM SERVICE DUE TO SPALLED ROLLERS. THIS PROBLEM WAS DISCOVERED DURING A ROUTINE 150-HOUR OIL FILTER ANALYSIS. THE ANALYSIS REVEALED M50 TOOL STEEL PLATELETS, WHICH IS MAIN BEARING MATERIAL. THE REMOVED BEARING WAS RETURNED TO THE OVERHAUL FACILITY.