Step 1 - Remove Chassis panels to access CPU cooler assembly

Step 2 - Disconnect radiator fan cables, feed through cable-access cavity

Cut and remove zip ties if necessary.

Step 3 - Replace windowless chassis panel

Step 4 - Lay system on windowless panel with motherboard-side facing up, and unscrew radiator fan assembly

Step 5 - Unplug Liquid CPU Cooling Block power cable from Motherboard

Cut and remove zip ties if necessary.

Step 6 - Unscrew CPU Cooling Block from Motherboard and remove Liquid CPU Cooler assembly from system

Be sure no other Liquid CPU fan or cooling block cables are strapped to the chassis or other parts of the chassis.

Done.