TM 9-2320-209-34-2-3 e. Replacement. FRAME 1 1. Aline screw holes in control box assembly (1) with screw holes in instrument panel (2). 2. Put in two capscrews and lockwashers (3) and two nuts and washers (4). 3. Slide in control box panel (5). Put in two screws (6). 4. Plug in electrical lead sockets (7). 5. Aline pins on electrical plug (8) and plug it into socket (9) on back of control box assembly (1). Put in nut (9). END OF TASK 21-138