As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 8000', CABIN FAULT LIGHT ILLUMINATED ON CABIN ALTITUDE PANEL. PRESSURIZATION IS CONTROLLABLE IN MANUAL. RETURNED TO FIELD, LANDING UNEVENTFUL. FOUND AFT OUTFLOW VALVE FAILED STATUS MESSAGE IN CDS. R & R AFT OUTFLOW VALVE IAW AMM TASKS 21-31-16-000-801 AND 21-31-16-400-801. CLEARED CDS FAULT AND C/W FUNCTIONAL TEST OF THE PRESSURIZATION CONTROL IAW TASK 21-31-00-720-801. FUNCTIONAL TESTED GOOD. NO FURTHER FAULTS IN CDS. ACFT OK FOR CONTINUED SERVICE.