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A genuine replacement iPhone part is a component manufactured by Apple or an Apple Authorized Supplier. First, carry out diagnostics and buy the necessary spare parts. You can buy spare parts in the online store https://appleparts.io/macbook-pro/macbook-pro-13-a2159/filter/category_30/displays__lcd_30/. Then purchase the correct replacement part, as well as the necessary tools such as screwdrivers, spatulas, and suction cups.