I need to replace one AirPod

Replacement instructions for lost items are provided at the bottom of this support article "If your AirPods are lost: --> https://support.apple.com/HT207581 Neither the warranty nor AppleCare+ helps with the cost of Airpods that are lost.

'AirPods Service and Repair' lists replacement fees. Click here --> https://support.apple.com/airpods/repair/service

1. If you can't find your AirPod or Charging Case, or if something is damaged, get the serial number. Click on this link to discover how to find the serial number. --> https://support.apple.com/HT209371

2. Contact Apple Support for a replacement. Click here --> https://getsupport.apple.com/?caller=kbase&PGF=PGF32003&category_id=SC0298

(You may have to go to the support article in my first link for the special Airpod replacement service link if that one doesn't work.)

3. Learn how to set up your replacement.

Set up your replacement AirPods or charging case - "When you get your replacement, follow these steps to use your AirPods again." --> https://support.apple.com/HT207827

See “Replace a missing AirPod or case” here.

How to find your lost AirPods, AirPods Pro, or AirPods Max - Apple Support