Rescue phal with strange brown streaked roots.

[greenpassion]

I brought this phalaenopsis home from work several weeks ago. It had been inside of a pot full of water. I let it dry out after I repotted it. It did have some viable roots, but these roots that are around the top are fairly dehydrated looking and lots of brown spots and streaks on them. Any idea what this is? The plant itself looks pretty good. I now have her in a pure bark mix on a heat mat in an East window. But I am concerned about these roots.