Epson EPL-N7000 - Manual (Page 250)

Installing Options 239
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11. Replace the right cover, as shown below.
Insert the two pins located at the bottom edge of the cover into
the holes on the right side of the printer, and then insert the
three protruding parts on the left edge of the cover into the
matching holes on the printer. Make sure that the upper edge
of the cover fits the upper part of the printer.
12. Fasten the right cover with the screws.