As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPAIR AND O/H FOR A METAL CONTAMINATION INSPECTION. DISASSEMBLY FINDINGS REVEALED THE SOURCE OF THE METAL CONTAMINATION WAS THE NR 4 ROLLER BEARING. THE BEARING EXHIBITED HEAVY SPALLING WITH DISCOLORATION IN THE FORM OF HEAT DAMAGE WITH ROLLER BEARING CAGE SEPARATION. THE BEARING WAS SUBMITTED TO MFG PROJECT ENGINEERING FOR A MATERIAL ANALYSIS.