As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, RECEIVED AN AUTO PRESSURE CAUTION MESSAGE AND BOTH PRESSURIZATION CONTROLLERS FAILED. LEVELED OFF, COMPLIED WITH AOM VOL 1 PROCEDURES AND CONTACTED SOC/MOC. DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE. ACFT LANDED WITHOUT INCDENT. ACFT REMOVED FROM SERVICE. R & R THE OUTFLOW VALVE IAW AMM 21-32-01. THE OPS CHECKED GOOD. ACFT RETURNED TO SERVICE.