As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATL/DFW - FLT 231 - RETURNED TO ATL DUE TO RT AND LT AIR CONDITIONING PACKS AIRFLOW WENT TO ZERO. RESET CIRCUIT BREAKER FOR GROUND COOLING FAN FOR RT AIR CONDITION PACK. ON LT AIR CONDITION PACK, FOUND DUCT TEMP INDICATOR STUCK AND PACK THERMAL TRIPPED. PACK COOLED AND RE-STARTED INBOUND TO ATL. GROUND CHECK OKAY.