What was found
DURING TAKEOFF, LT WINDOW CAME OPEN AT 40 KTS, STOPPED & CLOSED WINDOW, TAXIED BACK FOR TAKEOFF. CAPTAIN CLOSED & LATCHED LT SLIDING WINDOW BEFORE TAKEOFF. VERIFIED THAT THE LT SLIDING WINDOW WAS CLOSED & LATCHED UPON ARRIVAL. NO HISTORY LAST 90 DAYS. OK FOR SERVICE.