As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF ATL, A VERY NOXIOUS ODOR CAME FROM THE AIR CONDITIONING SYSTEM IT SET OFF THE AFT SMOKE DET IN AFT LAVS. ODOR REDUCED AND SEEMED SPENT AS A/C PRESSURIZED AND WE CLIMBED TO HIGHER ALT. RAN PACKS WITH ALL THREE ENGS AT T/O PWR NO DISCREPANCIES NOTED.