Lenovo ThinkPad X1 Hardware Maintenance Manual page 63

Applying labels to the back cover assembly:
The new back cover assembly is shipped with a kit containing labels of several kinds. Apply those labels
when you replace the back cover assembly. For the labels that are not shipped with the new back cover
assembly, peel them off from the old back cover assembly, and then adhere them to the new one.
The following illustration shows the location of each label.
Labels behind the kickstand:
Labels on the kickstand:
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Chapter 7 Removing or replacing a FRU