As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUL ODOR, CHRONIC HISTORY AND POSSIBLE OIL ODOR. RECOMMEND TROUBLESHOOTING REF MM. REPLACED LEFT RECIRCULATON FILTER REF MM. ACCOMPLISHED TROUBLESHOOTING PROCEDURE OUTLINED IN MM, NO DEFECTS NOTED. CHECKED RT ENGINE AND LT PACK FOR EXTERNAL OIL LEAKAGE, NO LEAKS NOTED. CHECKED LEFT ACM FOR LEAKS, NO LEAKS NOTED. RAN ENGINES AT HIGH POWER PER JRH AND RAN PACKS. SMELL HAS NOW DIMINISHED.