Repotting Vanda 'Cherry Blossom'

[mykl]

I won a potted vanda at our club several months back. The pot was deteriorating, I knew it would need to be repotted.

Now, I've never had a potted vanda, all mine have always "hung out in the altogether", as it were.
I found most of the roots black, in fact only a few inside the pot appear to be alive.
The air roots appear to be fine. So should I trim the dead roots and repot, or acclimate it to it live in the air?
TIA