As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STL - FLT 10 - AFTER TAKEOFF, COULD NOT PRESSURIZE CABIN IN EITHER PRIMARY OR STANDBY MODE. NR 1 SYSTEM. NR 2 SYSTEM PREVIOUSLY PLACARDED. FLIGHT RETURNED TO STL. REPLACED PRESSURE SELECTOR. CHECK OF PRIMARY AND SECONDARY CONTROLLERS OPERATION NORMAL. CHECK C-OD - 3-10-97 - STL. (X)