Can phal roots recover if not rotted?

[JerseyGirlBecky]

I just repotted a phal given to me by a friend. It was in the bark mixture. Don't know how much she watered.
The roots were all biege, no green ones at all, but they were still firm. I did not trim them, just repotted in new bark mixture and watered very lightly from the top.
Can they recover and maybe green up? Or will it have to make new ones? I do see it has a couple of new air roots coming.
Thanks, Becky