As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1442 - EN ROUTE DFW-STL - SHORTLY AFTER TAKEOFF RECEIVED CABIN PRESSURE MESSAGE DISPLAYED ON MFDU. UNABLE TO CONTROL CABIN PRESSURE IN THE MANUAL MODE. RETURNED DFW AND LANDED WITHOUT INCIDENT. RE-SEATED RIGHT SIDE ACM ACCESS DOOR. ACCOMPLISHED PRESSURIZATION CHECK. SYSTEM CHECKED NORMAL. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)