Lenovo M57e - ThinkCentre - 9481 Hardware Maintenance Manual page 141

3. Remove the heat sink from the system board by pivoting lever 1 until is in the vertical position.
4. To remove the microprocessor from the failing system board, release the lever 1 securing the
microprocessor 2 then pivot the microprocessor retainer 3 until it is fully open.
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Chapter 10 Replacing FRUs (Types 7066, 7098, 9352, 9359, 9482, 9487, 9622, 9704, 9785, 9794, 9807, 9859, 9952)