As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH WX RADAR IN AUTO/WX+T MODE THE WXR FAIL ANNUNCIATION ILLUMINATED FOLLOWED BY A VIBRATION FELT ON FLIGHT DECK ALONG WITH A NOISE THAT SUGGESTS RADAR WAS STUCK AND UNABLE TO SWEEP. ANNUNCIATION EXTINGUISHED AND BOTH VIBRATION AND NOISE STOPPED WHEN THE WX RADAR WAS TURNED OFF. GROUNDED - YES. REMOVED AND REPLACED WEATHER RADAR ANTENNA DRIVE UNIT REF B737-800 AMM 34-43-11-000-802 AND 34-43-11-400-802, OPS CHECK GOOD. GROUND VERIFICATION SUCCESSFUL.