Lenovo ThinkCentre M57 6086 Hardware Maintenance Manual page 127

11. Remove the four screws 1 securing the heat sink and fan assembly to the
system board.
12. Lift the heat sink and fan assembly off the failing system board. Place the heat
sink on its side so that the thermal grease does not come in contact with
anything.
Chapter 9. Replacing FRUs - Tower Computers
121