What was found
ATL/MDW - FLT 240 - RETURNED TO ATL DUE TO FLIGHT CREW COULD NOT PRESSURIZE AIRCRAFT IN AUTO OR MANUAL. REPLACED PRESSURIZED REGULATION VALVE FOR LEFT AIR CONDITIONING PACK AND SEGMENT.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ATL/MDW - FLT 240 - RETURNED TO ATL DUE TO FLIGHT CREW COULD NOT PRESSURIZE AIRCRAFT IN AUTO OR MANUAL. REPLACED PRESSURIZED REGULATION VALVE FOR LEFT AIR CONDITIONING PACK AND SEGMENT.