As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR DEPICTING CELLS IN BOTH AUTOMATIC AND MANUAL MODES WHERE NO WEATHER ACTUALLY EXISTS. CONFIRMED VISUALLY BY BOTH PILOTS. GROUNDED - YES. REPLACED WEATHER RADAR RT REF B737-900 AMM 34-43-41-000-801 AND 34-43-41-400-801. OPS TEST OK PER SAME REF. GROUND VERIFICATION SUCCESSFUL.