As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSING FL 180 SMELLED FUMES IN THE COCKPIT. RAN SMOKE AND FUME CHECKLIST. RETURNED TO MEMPHIS. SMELLED LIKE BURNING RUBBER OR PLASTIC. FACT REPLACED BOTH CONDENSER BAGS AND FOUND BOTH RT AND LT AIR CYCLE MACHINES OUT OF OIL REPLACED BOTH ACM RAN BOTH PACKS WITH APU AND ENGINE PNEUMATICS NO SIGN OF SMOKE OR SMELL PER JRH 21-51-011.