As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR CAUSES A CYCLICAL VIBRATION AND RUMBLE EVERY 9 SECONDS. WXR FAIL ANNUNCIATION ILLUMINATED BRIEFLY IN FLIGHT BUT EXTINGUISHED. GROUNDED - YES. FOUND WXR RADAR ANTENNA DRIVE UNIT BAD. REPLACED DRIVE UNIT IAW AMM 34-43-11. OPS CHECK AND GROUND VERIFICATION GOOD IAW AMM 34-43-00-710-802.