As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD-BUF - FLT 6314 - DURING FLIGHT, COULD NOT CONTROL PRESSURIZATION IN FLIGHT. ACFT DID AN EMERGENCY DESCENT DURING FLIGHT, AND RETURNED TO IAD WITH NO FURTHER INCIDENTS. MAINTENANCE REPLACED A KINKED STATIC LINE AT OUTFLOW CONTROL VALVE. ACFT WAS RELEASED AND APPROVED FOR SERVICE. (W)