What was found
AT CRUISE, LT FORWARD WINDOW OVERHEAT LIGHT ILLUMINATED. QRH PROCEDURE WAS NOT EFFECTIVE. ACFT GROUNDED. FOUND WINDOW HEAT POWER LEFT FRONT, C/B OPEN, ACCOMPLISHED GVI, NO DEFECTS NOTED, RESET C/B REF AMM 20-60-01. ACCOMPLISHED WINDOW HEAT SYSTEM OPS TEST REF AMM 30-41-00. OPS NORMAL.