Asus AP2400R-E1 - Manual (Page 18)

Chapter 2: Hardware setup 2-4
2.1.3 Removing the top cover
3. Firmly hold the cover on the front
and rear ends, then remove it
from the chassis.
2. With the front half of the top cover
open, slide the cover toward the
rear panel until the mid-hooks on
the top cover are disengaged.
Thumbscrew
To remove the top cover:
1. Loosen the thumbscrew that
secures the top cover on the rear
part of the chassis.
You need to open the front half of the top cover before you can remove
the entire top cover. Refer to section “2.1.1 Opening the top cover
(front half)” for instructions.