NEC POWERMATE P - SERVICE MANUAL 1996 Service And Reference Manual page 118

Figure Section 5-1 Removing Cover Screws
4. From the rear of the system, grasp the sides and slide the cover about an inch
away from the front panel (see Figure Section 5-2).
NOTE: The cover fits tightly. Press the front
edge of the cover to release it from the front
panel. Also try pressing against the rear panel to
slide the cover one inch away from the front
panel.
Figure Section 5-2 Releasing the Cover
Repair 5-3