What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AFTER TAKEOFF AUTOFAIL LIGHT ILLUMINATED, AIRCRAFT FAILED TO PRESSURIZE, ALTERNATE MODE INOPERATIVE AS WELL. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT RDU. FOLLOWED FIM TASK 21-31-00-810-801. REMOVED AND REPLACED (CPC)-CABIN PRESSURE CONTROLLER (AALA202604145210), PER AMM 21-31-01. ALSO, REMOVED AND REPLACED CABIN PRESSURE CONTROL MODULE (AALA202604147063), PER AMM 21-31-02. ALL REQUIRED TEST ACCOMPLISHED NO FAULTS AND PRESSURIZED.