As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT INTO ICT, PILOT REPORTED UNUSUAL NOISE FROM RT ENGINE. AFTER LANDING AND SHUT DOWN, ROTATION OF FAN BY LEAR JET MECHANIC CONFIRMED NOISE. INSP FOUND A BAYONET FROM A STUD IN THE TEETH OF THE FAN SUPPORT RING GEAR FOR GEARBOX. INSPECTION FOUND THE STUD THAT WAS MISSING THE BAYONET, THE STUD WAS REPLACED AND NO OTHER DAMAGE WAS NOTED.