What was found
AFTER TAKEOFF, LT FORWARD WINDOW OVERHEAT LIGHT ILLUMINATED, FOLLOWED QRH BUT LIGHT REMAINED ON, TURNED BACK DUE TO KNOWN ICING CONDITIONS AT MCI. MAINT FOUND A LOOSE WIRE IN TERMINAL LUG AT CIRCUIT BREAKER, RE-TERMINATED WIRE. R & R LT FWD WINDOW ANTI-ICE CIRCUIT BREAKER AND LT FORWARD WINDOW HEAT CONTROL UNIT IAW BMM, OPS CHK OF WINDOW ANTI-ICING SYSTEM GOOD. FUNCTIONAL TEST OF WINDOW HEAT CONTROL UNIT S/N 7103 CONFIRMED FAILURE OF UNIT FOR OUTPUT TEST. TEARDOWN OF UNIT FOUND TRANSFORMER T1 ARCING, REPLACED TRANSFORMER AND DEFECTIVE PARTS IAW CMM 30-40-02, REV. 14.