Replacing the headphone jack.

My friend's Macbook has the switch inside the headphone jack permanently stuck. I researched possible solutions and she tried getting it unstuck with a paper clip, a toothpick, etc. It didn't work. She took it to the Genius Bar where they told her it was permanently stuck and the repair would be $280.

If it's permanently stuck, the part needs to be replaced. My question is, how do I go about doing this, and where can I get the part?

Any help would be appreciated.