I got this plant about two years ago. It looked great on top with 15 pseudobulbs. When I got it unpotted it was a different story.
The problem was not dead roots. What set this plant back was that the roots had formed a tight ball. It was way overdue for re-potting.
I like to think that I am pretty good at re-potting. Even if I take my time, use lots of water and my fingers only (no cutting) there is still quite a lot of root damage.
I did what I could and then waited 4 months until I saw some new growth. At that time I divided it into three plants. This is the first of those plants to bloom.