What was found
DFW - DURING APPROACH TO DFW, LOWERED LANDING GEAR AND ALL FOUR ANTI SKID LIGHTS ILLUMINTATED ON OVERHEAD PANEL. CYCLED ANTI SKID SWITCH AND TWO LIGHTS WENT OUT. PERFORMED GO AROUND AND CYCLED GEAR, NO CHANGE. ON SECOND APPROACH ALL FOUR LIGHTS ILLUMINATED AGAIN. PULLED AND RESET CIRCUIT BREAKER AND ALL LIGHTS WENT OUT. LANDING AND ROLL OUT NORMAL. REPLACED ANTI SKID CONTROL UNIT. SYSTEM GROUND CHECKED NORMAL OPERATION.