Brother DCP-9055CDN Service Manual page 211

(3) Remove the Shaft of the Back cover from the Bush on the right side of the Main body.
(4) Remove the Back cover.
Back cover
Fig. 3-5
Main body
4a
Fig. 3-6
3-30
Main body
Pin
Bush
Shaft
<Back side>
4b
Back cover
<Back side>
Confidential