The fastest way to Upper Crawl is to go back to where Pawn 44 and Pawn 11 are working, ride the ladder up, follow the path to the right past the Cargo Containment Unit and go up the ladder on the left (you'll probably have to crouch). The panels are on the right along the hall. You only have to interact with them if the door is open. Keep following the Upper Crawspace to the front of the ship to find Upper Avionics where the remaing chips need to be replaced. If the way is barred, use one of the hatches to get down to the third floor, go through Global Operations, and in to the tiny door on the left side to get in to Upper Avionics.