What was found
CA DV WINDOW YELLOW PIN FOUND OPEN ON CLIMB OUT. COULD NOT CLOSE DV WINDOW IN FLIGHT NO AIR COMING IN. A/C WAS PRESSURIZING. EMERGENCY DECLARED. C/A: OPEN & CLOSE CAPT'S DV WINDOW AND VERIFIED FREE MOVEMENT & OPERATION OF YELLOW INDICATOR/FLAG. FOUND NO OBVIOUS DEFECTS WITH THE OPERATION. PERFORMED PRESSURIZATION CYCLE OF AIRCRAFT TO ENSURE WINDOW REMAINED IN PLACE DURING PRESSURIZTION/DEPRESSURIZATION, IAW AMM 21-31-00-860-801-A & 21-31-00-860-802-A. NO DEFECTS NOTED, END.