As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AT ATL, FLT 73, ATL TO MCO, AIR TURN BACK DUE TO UNABLE TO PRESSURIZE ON DEPARTURE IN AUTO OR MANUAL. TROUBLESHOT PRESSURIZATION TO INTERMITTENT FLOW CONTROL VALVE. REMOVED AND REPLACED FLOW CONTROL VALVE PER MM 36-12-11. PRESSURIZED A/C PER MM 21-30-00. OPS CHECK OK. (M)