Lenovo ThinkStation P920 Tower Workstation - Manual (Page 121)

Pivot the tab 1 upward to open the latch 2 inside the multi-function bracket.
Figure 97. Opening the card latch
Grasp the PCIe card retainer by its edges and gently pull it out of the latch. Remove the retainer
completely from the PCIe card latch.
Figure 98. Removing the PCIe card retainer
Chapter 7 . Hardware removal and installation 109