Fujitsu PRIMERGY CX2550 M6 Upgrade And Maintenance Manual page 196

Liquid cooling (LC)
Figure 126: Disconnecting the power cables of the pump 1 and 2
▶ Disconnect the LC power cables from the system board (see circle).
Figure 127: Releasing the four clamps on the DIMM memory module heat sinks
▶ Release the four clamps on the DIMM memory module heat sink (see
circles).
196 Upgrade and Maintenance Manual