What was found
RETURNED TO GATE DUE TO ARCING ODOR IN COCKPIT. CLICKING STATIC ON RADIO. WINDSHEAR INOPERATIVE FAILURE LIGHT STARTED TO FLICKER. ON WAY BACK TO GATE SMOKE BEGAN TO COME FROM UNDER THE INSTRUMENT PANEL. RAN ENGINES WITH ALL SYSTEMS OPERATING, LOOKED BEHIND INSTRUMENT PANEL (FE'S PANEL) AND E/E COMPARTMENT. NO DEFECTS NOTED. UNABLE TO DUPLICATE SMELL ON GRND. TEST FLT TO VERIFY OK FOR SERVICE.