Apple official repair service
The condition is that it is still within the warranty period and requires a formal invoice from Apple or an Apple authorized seller. The machine code on the invoice matches the code on the machine.
Free shipping on orders over 100$ USD
No reason, does not affect re-sale, return within 7 days.
Repair Terms and Conditions https://www.apple.com/hk/en/legal/sales-support/terms/repair/generalservice/servicetermsen.html
Before you send us your product, follow the appropriate instructions in Get your Apple device ready for service.
The shipping box will come with instructions for sending us your product. If you use other packing materials and then the product is damaged in shipping, we'll return the product to you without repairing it. Also, send us only the product itself. If you include extra items in the box, we won't be able to return them to you.
Be sure to send us your product within 10 business days. Otherwise, this repair request will be canceled. If you no longer need service, just recycle or dispose of the shipping box.
Coverage
Based on the information you've provided, we believe your repair will be covered by the warranty, an AppleCare product, or an Apple repair program. This means there should be no other charges. We'll let you know if we have questions or concerns about the coverage.