As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN WEATHER RADAR IS ON IN WX-T AUTO MODE, A VIBRATION COULD BE FELT IN COCKPIT FLOOR EVERY 10 - 15 SECONDS LASTING 2-3 SECONDS IN DURATION. VIBRATION GONE WITH WXR RADAR OFF. ACFT GROUNDED. REPLACED THE WX RADAR ANTENNA DRIVE UNIT. ALL OPS NORMAL IAW AMM 34-43-11, AND 34-43-00.