As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE KRFD TO KSMF, LEFT ENGINE HAD HIGH VIBRATION AT IDLE ON DESCENT (4.6 N2 ON THE VIB GAUGE) AUDIBLE INDICATIONS SIMILAR TO GRINDING. EMERGENCY DECLARATION WITH AIR TRAFFIC CONTROL FOR PRIORITY LANDING AT CONGESTED AIRPORT. AIRCRAFT LANDING UNEVENTFUL WITH NO ADDITIONAL PRECAUTIONARY ACTIONS TAKEN. AIRCRAFT GROUND ON LANDING FOR FAULT ISOLATION.