As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORF - FLT 124 - UNABLE TO PRESSURIZE ACFT AFTER TAKEOFF. FLIGHT RETURNED TO ORF WHERE LANDING WAS WITHOUT INCIDENT. MAINTENANCE SWAPPED FWD AND AFT ZONE TEMP CONTROL BOXES. OPS CHECK NORMAL. SWAPPED FWD AND AFT ZONE TEMP CONTROL BOXES. OPS CHECK NORMAL. SWAPPED UNITS BACK TO ORIGNAL CONFIGURATION, BITE TEST OF TEMP CONTROL UNITS OK. (W)