What was found
LEFT FRONT WINDSHEILD LIGHT ILLUMINATES IN FLIGHT WITH ASSOCIATED MASTER CAUTION. AT FIRST, LIGHT WOULD CYCLE ON AND OFF BY ITSELF, BUT LATER IT CAME ON AND REMAINED ON UNLESS SWITCH WAS CYCLED. FOLLOWED QRH. MAINTENANCE REPLACED LEFT FRONT WINDSHEILD LIGHT SWITCH. SECURITY AND OPS CHECKED GOOD.