Wilting leaves, dried out roots

[Arukou]

I am housesitting for a year, and the owner of the house has several lovely orchids. And then there is this one, with wilting leaves and roots that are dried out. I’m reasonably sure that it’s a Phalaenopsis orchid but not 100% sure, as it’s not currently blooming. There is no visible rot that I can see. The soil is moist to the touch, even several days after watering. It was receiving Full sun from roughly 7:30 AM to 12 PM and then partial sun after, I have moved it to the darker side of the window, but this doesn’t seem to have revived it, so I don’t think sun is the problem. I am at a loss as to whether this is disease, or some other possible problem, as I’ve never really kept orchids before. The owner has already reassured me that she doesn’t care if it dies, but I’d like to rescue it if possible. Any help would be appreciated.