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 AND THE AIRCRAFT RETURNED TO CLT DUE TO CABIN PRESSURIZATION #1 AND #2 ECAM MESSAGES WHILE CLIMBING THRU FL 180. THE AIRCRAFT LANDED SAFELY AT CLT WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE OUTFLOW VALVE PER AMM 21-31-51 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.