Here we have a beautiful Martin HD-28. The frets warrant enough wear to justify a partial refret. Your frets reach this point when there is not enough fret height left to dress out the problem spots. We are going to replace them with the exact same wire but a little taller in height.

 

Let's take a look at a partial refret. I've taken a picture every stage of this job from beginning to end. This is not a lesson in refreting, but a look on what goes into a refret.
A PARTIAL REFRET
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