As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTING MIA, CREW WAS UNABLE TO PRESSURIZE ABOVE 3.2 PSI DIFF WITH 4 T/C'S OPERATING. AIRCRAFT RETURNED TO MIAMI. FOUND NR 2 T/C DISCHARGE DUCT CONNECTOR SEPARATED. REMOVED AND REPLACED SEALS AT CONNECTOR AND RESECURED CONNECTOR. OPS CHECK NORMAL ON PRESSURIZATION CHECK. (M)