As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR IN AUTO MODE AT FL350 CONTINUALLY PAINTS GROUND CLUTTER. WHEN TAKEN OUT OF AUTO AND TILTED GROUND CLUTTER CAN BE REMOVED. GROUNDED - YES. DUE TO GROUND CLUTTER NOT BEING SUPPRESSED IN AUTO MODE, REMOVED & REPLACED WXR CONTROL PANEL REF B737-900 AMM 34-43-91-400-801. 1 EA C/B OPENED & CLOSED. INSTALLATION TEST OP CK GOOD PER THE SAME. GROUND VERIFICATION SUCCESSFUL. THIS CLEARS MEL 34-15D. NO CONFIG CHANGE. PLACARD REMOVED, C/N 17021467.