The earpiece speaker is responsible for the voice you hear duing a call, and is mounted to the mid-chassis frame which also holds the glass and LCD. When you have a damaged ear speaker, you need it to replace.
Parts offer a 90-Day warranty. The warranty period covers any defects in the material or the workmanship of the product. Warranty does not cover any damage done while using the product. Any product returned within warranty period will be eligible for a refund or a replacement.