As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT WHILE AT FL280, THERE WAS A SIGNIFICANT VIBRATION/SHUDDER AND E1 ITT GAUGE WAS IN THE RED RANGE. CHECKLISTS WERE FOLLOWED AND E1 WAS SHUT DOWN AND THE AIRCRAFT DIVERTED TO KMDT WHERE THE AIRCRAFT LANDED WITHOUT INCIDENT. THE ENGINE WAS CHANGED WITH NO FURTHER DEFECTS NOTED. DURING REPAIR, A BLADE FROM THE 6TH STAGE COMPRESSOR WHEEL WAS FOUND TO HAVE DETACHED.