As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT EN ROUTE FROM DPA TO LUK AT 9,000FT WHEN ENGINE STARTED CUTTING BACK ON IT'S OWN TO 1200LBS TORQUE AND NG FROM 98 PERCENT TO 91 PERCENT. BORESCOPED ENGINE, GROUND PERFORMANCE RUN ALL OK. REMOVED AND REPLACED FUEL CONTROL AS PRECAUTIONARY MEASURE.