As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"WXR FAIL" ENROUTE MCI. ABOUT 2 HOURS INTO FLIGHT WX RADAR FAILED AND STARTED VIBRATING LOUDLY. ATTEMPTED TEST AND BECAME WORSE. DIDN'T DARE USE IT AFTER THAT. GROUNDED - YES. NOTED GRINDING WHILE TESTING. REMOVED AND REPLACED WEATHER RADAR DRIVE UNIT REFERENCE AMM 34-43-11-000/400-802. OP CK GOOD REF AMM 34-43-00-710-802-001.