As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ODOR FROM AC VENT, NO SMOKE NOTED. RETURN TO FIELD, C/W ENGINE CLEANING FOR PERFORMANCE RECOVERY POST WASH PROCEDURE CHECKLIST IAW AMM 72-00-00. NO FURTHER DEFECTS NOTED AT THIS TIME. OVERWEIGHT LANDING INSP NOT REQUIRED AC UNDER MAX LANDING WEIGHT OF 67000 LBS IAW AMM 05-51-01.