Lenovo THINKCENTRE 6019 - Manual (Page 104)

7. Slide the system board toward the front until it can be lifted out of the
chassis.
8. Remove the heat sink and microprocessor from the failing system board and
install them on the new system board. See “Replacing the microprocessor” on
page 100.
9. Remove the memory modules from the failing system board and install them
into the same position on the new system board. See “Replacing a memory
module” on page 91.
10. Install a new retention module or move the retention module from the failing
system board to the new system board.
98 Hardware Maintenance Manual