You can hand over the headphones at any authorized Apple service center.
Apple has extended the validity of the headphone replacement program for a year. Devices manufactured before October 2020 may have problems.
You can replace headphones with crackling sound and loss of low frequencies or amplification of background sounds during noise reduction. The company will replace one or both headphones with defects, the charging case will remain the same.
Users have been complaining about AirPods Pro since their introduction in November 2019. At first, the company offered to update the devices and check the connection. After that, I released a firmware update. In October 2020, Apple recognized the problem and launched a device replacement program.