Insert one point of a pair of tweezers under the bottom left corner of the earpiece speaker.

The earpiece speaker sits in a deep recess and is secured with adhesive. If you have trouble getting under it, apply a few drops of high concentration (over 90%) isopropyl alcohol to help soften the adhesive.

Pry up to release the adhesive and remove the earpiece speaker.

It is possible to reuse the speaker adhesive when installing a replacement speaker, but if you need to replace the adhesive, you can do so with a pre-cut adhesive sheet.