As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WX RADAR DOES NOT SEEM TO MATCH ACTUAL WEATHER/PRECIPITATION OUTSIDE THE ACFT AS DEPICTED BY ATC RADAR OR VISUALLY. ACFT GROUNDED. ACCOMPLISHED WEATHER RADAR OPS CHECKED IAW AMM 34-43-00, OPS CHECKED NORMAL WITH NO HISTORY IN 30 DAYS. ALL GROUND FUNCTIONAL TESTS PASS.