As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE CREW REPORTED A LT FADEC MAJOR CAS MESSAGE. THE CREW PERFORMED AN AIR-TURN-BACK. MX COULD NOT DUPLICATE THE DISCREPANCY. MX REPLACED THE LT ELECTRONIC ENGINE CONTROL (EEC) FOR TROUBLESHOOTING AND RETURNED THE AC TO SERVICE. (K)