As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT FLT 1107 - DURING CRUISE, EN ROUTE FROM EWR TO CLT AT FL340, THE AIRCRAFT LOST CABIN PRESSURE. CABIN ALTIUDE CLIMBED TO 14,000 FEET. CREW DESCENDED FLIGHT AND REPRESSURIZED CABIN AT FL280. SYSTEM OPERATED OK IN MANUAL, BUT STANDBY WAS INOPERATIVE. APPEARS AFT OUTFLOW VALVE IS STICKING. FLIGHT LANDED AT CLT WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE AFT OUTFLOW VALVE PER MM 21-31-11. OPERATIONAL CHECK GOOD.