As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3305 - CREW REPORTED PRESSURIZATION WAS ERRATIC IN BOTH AUTO AND MANUAL MODES. AIRCRAFT STAYED PRESSURIZED ON GROUND. PRESSURIZATION WAS PUT ON MEL AT THIS TIME. MAINTENANCE REMOVED AND REPLACED THE PRESSURE CONTROLLER IAW SAAB MM 21-31-10. OPS CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)