As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON APPROACH FOR LANDING PILOT REPORTED "ROUGHNESS" FROM THE ENGINE AT THE LOWER POWER SETTINGS. GROUND RUNNING CONFIRMED ROUGHNESS WITH BLACK SMOKE COMING FROM TAILPIPE. ONE OF THE FUEL NOZZLE ASSEMBLIES WAS FOUND TO HAVE FUEL DYE RESIDUE, "GUMMY DIRT" PARTIALLY IMPEDING THE UPPER DECK PRESSURE AT THE NOZZLE. ALL SIX NOZZLE ASSEMBLIES INSPECTED, CLEANED , REINSTALLED. GROUND RUNS SATISFACTORY. (TC NR 20091216006)