Lenovo ThinkPad T61 7659 User Manual page 49

Replacing memory
c. Detach the connector of the palm rest cable by pulling the tab with
your fingers. Now the palm rest has been removed.
6. If two SO-DIMMs are already installed in the memory slot, remove one
of them to make room for the new one by pressing out on the latches on
both edges of the socket at the same time. Be sure to save the old
SO-DIMM for future use.
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Chapter 5. Upgrading and replacing devices