As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVED ENGINE ASSEMBLY FOR OIL LEAKS. REMOVED COMPRESSOR AND TURBINE FROM GEAR BOX TO REPLACE SEALS AND ORINGS. INSPECTION OF SPLINE ADAPTOR FOUND CRACK RUNNING APPROX 340 DEGREES AROUND ADAPTOR. TOTAL TIME ON PART IS 555.3 SINCE LAST OVERHAUL AT WHICH TIME THE ADAPTOR WAS REPLACED. CAUSE OF CRACK UNKNOWN AT THIS TIME.