Lenovo K23 Notebook - Manual (Page 104)

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Appendix C. Lenovo limited warranty
5
Product Exchange Service
Under Product Exchange Service, Lenovo will ship a replacement product
to your location. You are responsible for its installation and verification of
its operation. The replacement product becomes your property in exchange
for the failed product, which becomes the property of Lenovo. You must
pack the failed product in the shipping carton used to ship the replacement
product and return it to Lenovo. Transportation charges, both ways, are
paid by Lenovo. Failure to use the carton in which the replacement product
was received may result in your responsibility for damage to the failed
product during shipment. You may be charged for the replacement product
if Lenovo does not receive the failed product within thirty (30) days of your
receipt of the replacement product.