Oracle X5-4 Service Manual page 239

You need to move the air divider so you can access the disk drive backplane board. The divider
is mounted to the power supply side wall using two tabs that are inserted into slots in the side
wall.
a. Lift the air divider so the tabs clear the slots in the power supply side wall.
b. Move the air divider away from the side wall and gently rotate the divider
and the cables attached to it away from the backplane area and set it on top
of installed memory risers.
7. Disconnect the ribbon data cable and the power cable at the bottom of the disk
backplane board.
See the illustration shown in step 8.
8. To release the spring-loaded lever [1], lift it upward [2].
The disk drive backplane sets on metal flanges and is secured by a spring-loaded lever.
9. To remove the disk drive backplane, lift it, so it clears the support flanges, and
remove it from the server.
Replace the Disk Drive Backplane (FRU)
Servicing FRU Components 239