As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO CONTROL PRESSURIZATION DURING CLIMB. PERFORMED AIR TURNBACK - OVERWEIGHT LANDING INTO KMIA WITHOUT ANY FURTHER INCIDENTS. PRESSURIZED AIRCRAFT AND FOUND CABIN ENTRANCE DOOR ANGLE-SEAL UPPER AND LOWER RETAINER PARTIALLY OPEN, LUBE CABIN SEAL IN ACCORDANCE WITH M/M 12-83-1; OPERATIONAL CHECK NORMAL IN ACCORDANCE WITH M/M 21-30-0; PRESSURALIZATION NORMAL.