Lenovo ThinkSystem SR860 V3 User Manual page 210

Step 4. Disconnect all the PCIe cables from the inside of the PCIe riser.
Figure 149. Disconnecting PCIe cables from inside of riser
Step 5. Remove the three screws that secure the PCIe retainer; then remove the PCIe retainer.
Figure 150. Removing PCIe retainer from riser
Step 6. Remove the five screws that secure the PCIe riser card; then, remove the PCIe riser card from the
PCIe riser cage.
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