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: ON CLIMB OUT AT ROUGHLY 5000 FEET WE HAD THE MC AND EQUIP DOOR ILLUMINATE. IN ADDITION THE AIRCRAFT WAS NOT PRESSURIZING AT 8000 FEET. DESCENDED TO 4000 AND RAN QRH PROCEDURES; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT RDU. REMOVE AND REPLACED CABIN PRESSURE CONTROLLER. OPERTIONAL CHECK GOOD. PRESSURIZATION SYSTEM GROUND TEST ACCOMPLISHED. SYSTEM PASSED. PER AMM 21-31-01.