As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INITIAL CLIMBOUT, CREW NOTICED THAT THE AIRCRAFT WAS NOT PRESSURIZING. REQUESTED TO LEVEL OFF AT 5,000FT THEN RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE DIGITAL PRESSURE CONTROLLER PER AMM 21-31-01 AND PERFORMED OPERATIONAL CHECKS PER AMM 21-31-00, NO DEFECTS NOTED, PRESSURIZATION CHECKS GOOD.