As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 320 CABIN PRESSURIZATION CONTROL WAS SET TO 340 FOR FOR A SELECTED CABIN 4,500 FT CABIN CLIMBED TO 8500 FT. CABIN PRESS CONTROL LEVER PHYSICALLY LIMITED TO 2" FROM FULL CLOSED. THE CREW RETURNED BACK TO DEPARTURE WITHOUT FURTHER INCIDENT. MX FOUND THE OUTFLOW VALVE PRESSURE ACTUATOR WAS NOT WORKING AND R & R IAW MM 21-31-0. THE ACFT WAS RETURNED BACK TO SERVICE.