IBM RS/6000 7043 43P Series Service Manual page 208

6. Make a note of where the other cables and cords are connected to the back of
the system unit; then disconnect them.
7. If you have not already done so, remove the display from the top of the system
unit.
8. Unlock the cover. Then, while holding down the cover latch at the rear of the
system unit, slide the cover to the rear approximately 1 inch. Grasp the cover on
both sides and lift it away from the system unit.
Cover L ock
8-4
7043 43P Series Service Guide
Cover L atch