How can I replace the Headphone Input?

@the headphone jack is mounted on the daughterboard (charging board). Replace that to replace the jack. Since iFixit does not yet have a guide for that, use something like this video You don't have to remove the main board. The daughterboard is readily available at many online stores.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!