As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED A PRESSURIZATION ISSUE ON TAKEOFF , THE CABIN CLIMBED TO 2000 FT AND THE DESCENDED TO 5000 FT. THEY INDICATED THE PRESSURIZATION FLUCTUATED WITH ENGINE POWER CHANGES DURING DESCENT. THE BASE MAINTENANCE TEAM TROUBLESHOT AND SUSPECTED A INTERMITTENTLY FAULTY OUTFLOW/SAFETY VALVE CONTROLLER. THE SUSPECTED FAULTY CONTROLLER WAS REMOVED AND AN OVERHAULED CONTROLLER INSTALLED. GROUND CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.