What was found
LEFT WINDOW OVERHEAT LIGHT CAME ON DURING CLIMB, FOLLOWED QRH PROCEDURE. LIGHT STAYED OUT FOR APPROX 15 MIN THEN CAME BACK ON WHILE LEVEL AT FL 310 OUTSIDE TEMP -39 DEGREE SAT. GROUNDED - YES. PERFORMED LEFT SIDE/SLIDER WINDOW CONT BITE REF FIM 30-41 TASK 801. WINDOW SENSOR FAULTS IN BIT, VERIFY AND FAULT HISTORY. AIRCRAFT RELEASED PER MEL 30-11E LEFT NR 2 WINDOW ELECTRIC HEAT INOP". REPLACED LEFT NR 2 OPENABLE WINDOW PER AMM 56-12-11-400-801, OPS CHECK AND LEAK CHECK NORMAL. CLEARED MEL 30-11E.