Dell Precision T3400 (Late 2007) - Manual (Page 180)

180
Adding and Replacing Parts
5 Press the release tab on the card retention cover and pivot the cover open.
NOTE:
You can remove the card retention cover, if desired, and set it aside.
1 release tab 2 card retention door
3 alignment bar 4 alignment guide
5 filler bracket
2
1
5
4
3