As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURIZATION CONTROL ERRATIC DURING CLIMB. PILOT RETURNED TO DEPARTURE AIRPORT AS A PRECAUTION. INSPECTED PRESSURE CONTROLLER, FOUND LOOSE HOSE ON CONTROLLER, RESECURED HOSE IAW PRESSURE CONTROLLER REMOVAL AND INSTALLATION INSTRUCTION. NO DEFECTIVE PART FOUND AND NO FURTHER DEFECTS NOTED.