As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO PRESSURIZATION SYSTEM FAILED AFTER TAKEOFF. CABIN ALTITUDE CLIMBED IN CONJUNCTION WITH AIRCRAFT ALTITUDE. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED CABIN PRESSURE RESET REGULATOR AND AMPLIFIER, OPERATIONAL CHECK NORMAL.