As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE PRODUCING LOW POWER. REMOVED TURBINE ASSY AND SEPARATED GAS PRODUCER FROM POWER TURBINE. FOUND NR 1 TURBINE WHEEL SEVERELY CORRODED AFTER ONLY 708.5 HRS TT. WHEEL LIFE IS 1775.0 HRS. TIP CLEARANCE WAS ALSO EXCESSIVE. NO EVIDENCE OF FOD. LEADING EDGES WERE FLATTENED. THIS, ALONG WITH NOZZLE SEPARATION, CAUSED HIGH N1 WITH HIGH TEMPERATURE AND LOW POWER.