What was found
AIRCRAFT WAS GROUNDED: AIRCRAFT RETURNED TO MIA, CABIN ALTITUDE EXCEEDED 10,000 W/ CORRESPONDING WARNING. LEVELED OFF TO ATTEMPT CONTROL OF CABIN MANUALLY BUT COULD NOT GAIN ACCEPABLE READINGS ON CABIN PRESSURE ALSO COULD NOT RESET AUTOPILOT OR AT CMDA. REMOVED AND REPLACED NR 1 CABIN PRESSURE CONTROLLER IAW AMM 21-31-01 OPS CHECK OK, REMOVED AND REPLACED CABIN PRESSURIZATION CONTROL MODULE IAW AMM 21-31-02. ALSO SEE: AALA202001149021.