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If you have not done so already, troubleshoot the fault before replacing a
PDU.
See Troubleshooting a PDU.
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Follow the safety and ESD precautions and the preparation
guidelines.
See Preparing for PDU Service.
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Arrange for an assistant to help you remove and carry the PDU to a
workbench.
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Power off and disconnect adjacent components.
See Power Off and Disconnect Components.