What was found
WEATHER RADAR INOP. RECYCLED SWITCH AND SHOWED WXR STAB FOLLOWED BY WXR FAIL. PWS FAIL ILLUMINATED ON APPROACH. GROUNDED - YES. TROUBLESHOT PER B737-800 FIM 34-43 TASK 815. PERFORMED BITE PROCEDURE PWS FAIL & WXR FAIL SHOWS ON BOTH DU'S TEST WILL NOT PASS. PERFORMED WEATHER RADAR R/T MANT OPS CHECK NO DEFECTS NOTED. CHECKED VOLTAGE FROM -22 TO WXR R/T, READS 115VAC BUT FOUND NO AC VOLTAGE OUTPUT FROM WXR R/T TO WXR CONTROL PANEL PER B737-800 WDM 34-41-11. REPLACED WEATHER RADAR RECEIVER/TRANSMITTER PER B737-800 AMM 34-43-41/401. PERFORMED OPERATIONAL TEST PER AMM TASK 34-43-00-710-802-001, SYSTEM OPS CHECKS GOOD, ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.