As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WOULD NOT PRESSURIZE DURING CLIMB. THE AIRCRAFT RETURN SAFELY TO DEPARTURE AND TAXIED TO THE MANUFACTURER SERVICE CENTER TO TROUBLESHOOT THE FAILURE. MANUFACTURER TESTED THE PRESSURIZATION SYSTEM AND WAS UNABLE TO DUPLICATE THE FAULT OR FIND ANY DEFECT THAT CAUSED THE PROBLEM. THE AIRCRAFT WAS RETURNED TO SERVICE AND HAS NOT EXPERIENCED ANY ADDITIONAL PROBLEMS WITH THE PRESSURIZATION SYSTEM.