As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 577 - PIT-CRW - AIRCRAFT WOULD NOT PRESSURIZE. SELECTED CONTROLLER TO HIGHER BUT NO EFFECT. SHUT OFF PACKS. RETURNED TO PIT. NO OTHER PROBLEMS FOR DURATION OF FLIGHT. MAINTENANCE RESET THE MANUAL PRESSURIZATION SHUTOFF VALVE AND SECURED IT. PRESSURIZATION CHECK NORMAL. (M)