As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MGB REMOVED FOR OIL LEAKING FROM CRACK IN RING GEAR CASE. UPON DISASSEMBLY AT REPAIR STATION DISCOVERED A SECTION OF 13 SPLINE TEETH ON THE UPPER RING FRACTURED. 7 TEETH WERE COMPLETELY SEPARATED FROM THE CASE BUT HELD IN PLACE BY THE INNER RING GEAR ASSY. THERE WERE MULTIPLE CRACKS ORIGINATING FROM THE ROOT AREA OF THE FRACTURED SPLINES IN ADDITION TO THE CRACK THAT BREACHED THE OUTSIDE OF THE CASE AND LEAKED OIL.