As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: CONTROL CABIN ZONE TEMPERATURE LIGHT ON RECALL, FLIGHT DECK TEMP UNCONTROLLABLE IT IS STUCKED AT FULL COLD 40 DEGREE SUPPLY DUCT TEMP READING. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. (OPEN).