Lenovo thinkpad 13 User Manual page 122

5. Pivot the keyboard slightly upward as shown by arrow
side of the keyboard. Then turn the keyboard over as shown by arrow
6. Put the keyboard on the palm rest and detach the connectors. Then remove the keyboard.
To install the new keyboard, do the following:
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ThinkPad 13 User Guide
1 until you can see the connectors on the bottom
2 .