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: LEFT PACK CAME ON DURING CRUISE AND LEPT FAILING. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. ACCOMPLISHED FIM TASK 21-62-00-810-830, REMOVED AND REPLACED LEFT TCV, PER AMM 21-51-10. OPERATIONAL CHECK AND LEAK CHECK GOOD AT THIS TIME.