Lenovo ThinkCentre A70 7099 Hardware Maintenance Manual page 145

4. Pivot the drive bay assembly upward, remove the four screws that secure the
heat sink fan duct, and then lift the heat sink fan duct up to remove it from
the chassis.
Figure 56. Removing the heat sink fan duct
5. Disconnect the power supply assembly cables from all drives and from the
24-pin power connector and 4-pin power connector on the system board. See
"Locating parts on the system board" on page 120.
Note: You might also need to release the power supply assembly cables from
some cable clips or ties that secure the cables to the chassis. Make sure that
you note the cable routing before disconnecting the cables.
Chapter 9. Replacing FRUs - Desktop computers
139