IBM Power System PCIe3 Manual page 24

Figure 8. Location of the ESD jack on the rear of the EMX0 PCIe3 expansion drawer
5. At the rear of the EMX0 PCIe3 expansion drawer, put the cable management bracket in the service
position. See Figure 9 on page 9.
a. Pull out the quarter-turn fasteners (B) and turn them to disengage them while you lift the cable
management bracket (A) to its raised position.
b. Turn the quarter-turn fasteners (B) to engage and lock the bracket into position.
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Power Systems: PCIe3 6-slot fanout module for the EMX0 PCIe Gen3 I/O expansion drawer