As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE ENGINE WAS REMOVED FROM THE A/C AFTER TWO CHIP LIGHT EVENTS. WHILE DISSASSEMBLING, THE ENGINE GEARBOX, A BEARING ROLLER FELL OUT ON TO THE WORK BENCH. FURTHER EXAMINATION REVEALED THAT THE CAGE INSIDE THE NR 4 BEARING HAD COMPLETELY SPLIT IN HALF.