Lenovo ThinkStation P410 Hardware Maintenance Manual page 110

3. At the rear of the computer, press the release button
Figure 19. Opening the PCI card latch
4. Pivot the tab on the front fan assembly outward to open the latch inside.
Figure 20. Opening the latch on the front fan assembly
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ThinkStation P410 Hardware Maintenance Manual
1 to open the card latch 2 .