What was found
FLT#8426, SJD-JFK. (AIRCRAFT DIVERTED TO JFK) 'WX RADAR WORK AFTER THE ANTENNA CHANGED FOR THE FIRST HOUR AFTER DEPARTURE IT FAILED SHORTLY AFTER THAT WITH THE RED WXR-T ON THE MD. AND ON APPROACH PRED WINSHEAR FAULT SAME AS THE PREVIOUS FLIGHT. ( WEATHER RADAR SYSTEMS ); POST FLIGHT REPORT SHOWING RTU 13SQ1 OR WX RADAR XCVR 1SQ1 AT FAULT. PERFORMED WIRING CHECK OF WIRES/CABLES BETWEEN BOTH UNITS, NO EFFECTS NOTED. AS PRECAUTIONARY REMOVED AND REPLACED TRANSCEIVER 1SQ1 IAW AMM 34-41-33. OPS TEST GOOD REF AMM 34-41-00. MDDR CLEARED PLACARD REMOVED UPDATED MX-4.'