HP ProLiant DL385p Gen8 User Manual page 45

If a full-length expansion board is installed in the primary PCIe riser cage, release the full-length
6.
expansion board retainer, and then remove the PCIe riser cage.
If a full-length expansion board is installed in the secondary PCIe riser cage, release the full-length
7.
expansion board retainer, and then remove the PCIe riser cage.
Hardware options installation 45