What was found
AFTER TAKEOFF, CABIN PRESSURE WAS RISING OUT OF CONTROL, SWITCHED TO MANUAL CONTROL WITH SAME RESULTS. AIRCRAFT RETURNED TO BHM. REPLACED THE ELECTRONIC PRESSURE CONTROLLER.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER TAKEOFF, CABIN PRESSURE WAS RISING OUT OF CONTROL, SWITCHED TO MANUAL CONTROL WITH SAME RESULTS. AIRCRAFT RETURNED TO BHM. REPLACED THE ELECTRONIC PRESSURE CONTROLLER.