Dark spots on Phal

[Melody]

This is my mother's orchid. She wanted me to ask you guys about a problem she is having.

This plant recently developed dark mushy spots on it's newest leaf. At the time, the plant looked as though it was hardly potted. The plant was on it's side with maybe 2 long roots in the media and a bunch of aerial roots growing everywhere. I advised her to at least repot it, which she did and she cut off the leaf with the mushy spots hoping that it would stop it from spreading. It was also sprayed with orthonex as well. This was about a week ago.

Today, it is showing more dark mushy spots just starting to develop on another leaf. Any ideas? Is this plant savable?