Epson EQUITY 386/33 PLUS - Manual (Page 45)

5. The cover is also secured by two latches on the back, near the
comers. Press both latches inward and then lift up the cover
from the back panel. You might meet some resistance from
the grounding tabs along the inside of the cover.
6. Pull the cover away from the front of the computer to
completely remove it. Then set it aside.
Accessing Internal Components 3-3