As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR PAINTS/ DEPICTS FALSE WEATHER RETURNS, SHOWS WEATHER WHERE NONE EXISTS AT APPROXIMATELY EIGHTY MILES (80NM) RANGE, LEFT AND RIGHT OF THE NOSE IN BOTH WX MODE AND WX + T MODE. GROUNDED - YES. PERFORMED WEATHER RADAR OPS TEST REF B737-800 AMM 34-43-00-710-802-001 NO DEFECTS NOTED NO 30 DAY HISTORY.