As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TURBINE AND FUEL NOZZLE SENT TO SHOP FOR ENGINE MAKING METAL. REMOVED FUEL NOZZLE FROM COMBUSTION SECTION AND FOUND HEAVY CARBON BUILD-UP ON BOTTOM OF SHROUD HOUSING AND ALSO CARBON BUILD-UP INSIDE COMBUSTION LINER. FUEL NOZZLE WAS SHIMMED AT .341 INCH. CARBON BUILD-UP SEEMS TO BE CAUSED BY SMOKELESS LINERS.