As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AMA - FLIGHT 4565, DURING CRUISE FLIGHT THE CREW REPORTED THAT THE NUMBER ONE ENGINE N1 DECREASED FROM 82% TO 67% TWICE WHILE ON FADEC A. THE AIRCRAFT LANDED AT AMA WITHOUT INCIDENT WHERE MAINTENANCE REMOVED AND REPLACED THE NUMBER 1A FADEC, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.