As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SOLID RADAR SHADOW RETURN (IN BOTH AUTO AND MANUAL MODE) ALTERNATING IN EITHER THE 11 OCLOCK FOR 2 OCLOCK POSITION. LONG SLIM "PIZZA SLICE" FROM THE AIRCRAFT SYMBOL. DOES NOT MATCH WITH VISUAL ATMOSPHERIC CONDITIONS. WX FAIL AND PWS FAIL ON FINAL FOR 3-5 SEC THEN CLEARED ON ITS OWN. GROUNDED - YES. REMOVED/REPLACED WXR PROCESSOR REF B737-9 AMM 34-41-42.