headlicht assembly will not come out

My service information shows two release levers and two screws but that may be incorrect. There may be only one of each. If the headlight assembly on your 2007 Chevrolet Uplander is loose but won't come out then you probably have all the fasteners off. There still may be a "ball & socket" holding the outside of the light assembly. Grasp the outside edge and give a sharp tug forward to release the ball & socket.