What was found
ATB, ON CLIMB OUT,(WXR FAIL) DISPLAYED ON BOTH CAPT AND FO ND. INTERMITTENT (WXR SYS) STATUS MESSAGE DISPLAYED. RESULTED IN AIR TURN BACK. OII 1 FOUND EVIDENCE OF ARCHING ON SOCKET 2 CONNECTOR D391C AND NO PIN RETENTION. REPLACED ALL USED SOCKETS OF CONNECTOR D391C SWPM 20-71-14. FOUND EVIDENCE OF ARCHING ON WX TRANSCEIVER PIN 2. R&R WX TRANSCEIVER MM 34-43-01. DURING OPERATIONAL TEST AT 60 MIN WX FAIL CONT MESSAGE. R&R WX RADAR CONTROL PANEL MM 34-43-02. ACCOMPLISHED OPERATIONAL TEST MM 34-43-01 FOR 90+ MINUTES NO FAULTS FOUND.