The ear speaker stopped working
Using the ifixit tool kit the repair was easy - took about 15 minutes, the ear speaker works!
Use the toolkit and instruction video on line
My girlfriend's iPhone 5c suddenly had very low volume using the earpiece speaker. It was fine in speakerphone or using headphones, and no changes in settings were able to resolve the issue.
The reassembly process was a bit challenging. After replacement of the speaker, the problem was unchanged. Ult . . .