As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 19 - UNABLE TO CONTROL PRESSURIZATION AFTER TAKEOFF. FLIGHT RETURNED TO PIT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND MANUAL DC CIRCUIT BREAKER POPPED, RESET C/B. REPLACED OVERHEAD CONTROL PANEL. ALL CHECKS NORMAL. REF USAA950403.