As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)REDUCTION GEAR BOX MAKING METAL. LEFT HAND #10 BEARING, ONE BALL SPALLED. REMAINING OIL IN THE GEARBOX WAS VERY DIRTY AND FOUND TO CONTAIN HIGH LEVELS OF PHOSPHORUS AND VANADIUM. SEVERAL OTHER BEARING S HAD PITS AND DISCOLORATION SIMILAR TO CORROSION THAT MAY BE RELATED TO THE CONTAMINATED OIL.