Zygopetalum Mathina Meadows died

[Rhonda Svoboda]

Hello Advanced Orchid Growers:
Full disclosure- I am not an advanced grower nor a novice. I am posting this question here because I am in need of expert help.
I purchased a Zygopetalum Mathina Meadows this spring. It bloomed and looked like an all round healthy plant. Then it slowly died.
All I am left with are a few pseudobulbs (dead) and 1 small new growth. When I looked at the roots they were all rotten and mushy. There's 1 healthy root.
Heres my question: Whats the best way to save this plant? I didn't remove the old pseudobulbs even though those roots are rotten because I am thinking they have stored food. I can't cut off any more of those roots.
I put it in spaghman moss which I am keeping moist.
Any ideas?
Thanks

[estación seca]

The only thing to add would be to keep it as cool as possible. From what you describe it's not likely to live. These don't like heat at all.

[Rhonda Svoboda]

Ok.Thanks. I'll just see what happens.