As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1319 - EN ROUTE DFW-PDX, SHORTLY AFTER DEPARTURE DETECTED AIRCRAFT WOULD NOT PRESSURIZE. AIR INTERRUPTED, RETURNED DFW AND LANDED WITHOUT FURTHER INCIDENT. REPLACED PRESSURIZATION VALVE ACTUATOR. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)