As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEAVY OILY SMELL REPORTED FROM THE LEFT AIR CONDITIONING SYSTEM ON TAKEOFF AND DESCENT BELOW 5000 FEET. ACCOMPLISHED CHECKS AND RESULTS NEGATIVE. RECIRCULATION SYSTEM FILTERS WERE CLEAN. ACCOMPLISHED PACK BURN OUT. AIRCRAFT FERRIED TO STL FOR FURTHER WORK. REMOVED AND REPLACED APU.