As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH WITH FLAPS AT 20 DEGREES, GEAR DOWN AND POWER AT FLIGHT IDLE A PRONOUNCED VIBRATION WAS FELT THROUGHOUT THE AIRFRAME. PERFORMED AMERICAN EAGLE VIBRATION WORK CARD WITH NO DEFECTS NOTED - BALANCED LEFT AND RIGHT PROPELLORS. OPERATIONAL CHECK GOOD - PERFORMED FUNCTIONAL CHECK FLIGHT WITH NO DEFECTS NOTED - RETURNED AIRCRAFT TO SERVICE