What was found
WX RADAR FAIL. WAS INTRMITENT WITH FULL FAIL THROUGH FL200 WHEN AIRCRAFT RETURNED TO GATE PERFORMED GND TEST CHKD GOOD.UPON GROUND CHKS GOOD. FURTHER INVESTIGATION FOUND BLOWER FAN INOP AND BOX WAS VERY HOT ROTABLE PARTS CHANGE WAS INDICATED - TT # 1509688 SN OFF 9915 TO TOUCH. REMOVED AND REPLACED BLOWER IAW AMM 34-43-51, PARTS USED: 99-3443-9-0007,QTY :1 AND ALSO REPLACED AS PRECAUTIONARY RADAR TRANSCEIVER IAW AMM 34-43-41. TRANSCEIVER, WX OFF 99-3443-9-0007 9915 ON 99-3443-9-0007 0002