What was found
WX RADAR INOP. RADAR DISPLAY INDICATED "PWS FAIL, WXR FAIL, AND 1"BOTH CA/FO DISPLAYED SAME, ALL MODES SELECTED INDICATED SAME FAILURES. WHEN SELECTED RADAR ON, HEARD AND FELT A SHUDDER. WX RADAR CIRCUIT BREAKER IN & NORMAL. GROUNDED - YES. PERFORMED WX RADAR SYSTEM BITE TEST; GOOD TEST PASSED. CHECKED AND VERIFIED P6-1 C/B D13 PUSHED IN. VERIFIED SYSTEM TEST PASSED REF B737-800 FIM 34-43 TASK 801. SOURCE DISPLAY ALL ON 1, ALL ON 2, AND AUTO PASS TEST ON BOTH CAPT. AND F/O DEU'S. "PWS FAIL, WXR FAIL, AND ANT 1" MESSAGES NOT DISPLAYED WHEN PERFORMING TEST. A/C OK FOR SERVICE.