Earpiece speaker just stopped working one day. Headphone and bluetooth phone activity worked fine, so I figured I'd try the earpiece module.
Very well. Only problem was that a black frame ring that wraps around the edge of the screen snapped but that might have been broken when a phone repair company replaced my broken screen a while ago. Still, the repair was very easy, using the video for reference.
Use a solid-color cloth to work over so screws don't bounce and can be found easily.