HPE ProLiant DL385 Gen10 Plus v2 Maintenance And Service Manual page 58

7. Disconnect the -48 V and return wires from the power supply.
To replace the component, reverse the removal procedure.
Removing and replacing a power supply blank Removing and replacing a power supply blank
Procedure Procedure
Remove the component as indicated.
HPE ProLiant DL385 Gen10 Plus v2 Server Maintenance and Service Guide 58