As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF HAD SMOKE AND ODOR ENTER CABIN. RETURNED ATL. FOUND PNEUMATIC SYSTEM CONTANIMATED. A WATER BASED SOLUTION WAS DRAINED FROM GROUND AIR CONNECTION. RAN BOTH ENGINES AND PACKS AFTER 1 HOUR HAD NO ODOR. RETURNED TO SERVICE.