As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON REACHING FL240 AND LEVELING OFF FOR CRUSE THE RIGHT SIDE SCREENS SHOWED RED X ACROSS THEM. GPS SYSTEMS RESET AND BECAME UNAVAILIBLE TO THE FLIGHT CREW. PRESSURIZATION WOULD NOT DEPRESSURIZE FLIGHT CREW HAD TO MANUALLY DUMP THE PRESSURIZATION. FMS UNAVAILABLE. FLIGHT WAS ABORTED AND AIRCRAFT WAS VECTORED BACK TO THE AIRFIELD. GPS SYSTEMS SHOWED LOCATION AS PHOENIX, AZ. TROUBLESHOOTING WITH HONEYWELL SHOWED A FAILED POWER SUPPLY FOR MAU CHANNEL B.