As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE HAD HIGH OIL CONSUMPTION. DISASSEMBLED PT SECTION OF TURBINE AND DISASSEMBLED PT ROTOR. FOUND EXCESSIVE AMOUNT OF OIL BETWEEN PT INNER AND PT OUTER SHAFTS. CLEANED OFF PARTS AND INSPECTED. DISCOVERED CRACK IN INNER SHAFT BELOW INNER NUT THREADS WHICH CAUSED LACK OF TORQUE OF PT ROTOR ALLOWING OIL TO PASS THROUGH 9-11/13-18 SEAL GOING THRU INNER SHAFT AND ROTOR. NOTE: CRACK WAS APPROX .2500 OF THE DIAMETER AROUND THE INNER SHAFT AND THROUGH WALL TO INSIDE DIAMETER OF SHAFT.