As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN ATTEMPTING TO USE WX RADAR THE "WXR FAIL" MESSAGE COMES ON ON ND SCREEN. GROUNDED-YES. ACCOMPLISHED "WEATHER RADAR ANTENNA PROBLEM" FAULT ISOLATION, SHOWS "WXR FAIL ANT" MESSAGE. REMOVED & REPLACED WXR ANTENNA DRIVE UNIT, REF B737-800 AMM 34-43-11, "WXR FAIL ANT" MESSAGE DISAPPEARED, BUT NO RADAR VIDEO AND ACCOMPANYING "WXR FAIL" MESSAGE ON ND. REMOVED & REPLACED WXR R/T UNIT. OPERATIONS CHECK NORMAL, REF AMM 34-43-00-710-802-001.