As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT-CMH - FLT 8003, THE AIRCRAFT WOULD NOT PRESSURIZE AFTER TAKEOFF AND THE FLOW LIGHT WAS ON CONTINUOUSLY. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT AIR CONDITIONING PRESSURE REGULATOR VALVE AND REPLACED THE CLAMPS ON A LOOSE DUCT ON THE RIGHT HEAT EXCHANGER. (M)