HPE ProLiant DL380 Gen11

c. Verify that the nuts are disengaged. Partially lift the cold plates away from the socket, and then set them back down.
8. Holding the hose between the cold plates and the riser cage, lift the assembly away from the server.
To remove the NS204i-u assembly:
HPE ProLiant DL380 Gen11 Server Maintenance and Service Guide 132