As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MGB CHIP PLUGS INDICATED A METAL IN OIL CONDITION. THE MGB WAS REMOVED AND SENT TO COMPONENT OVERHAUL SHOP TO DETERMINE CAUSE OF METAL. OHS COMPLETELY DISASSEMBLED THE MGB AND DETERMINED THE BEARING CUP IN THE LEFT HAND BEVEL SPUR GEAR ASSY WAS THE PRIMARY CAUSE OF METAL. THE BEARING CONE SB3317-101 WAS ALSO SCRAPPED DUE ROLLOVER DAMAGE CAUSED BY THE BEARING CUP FAILURE. THE LT INPUT PINION 76351-09132-102 AND BEVEL GEAR 76351-09011-106 WERE SCRAPPED DUE TO UNUSUAL PATTERN ON THE TEETH.