The Phal abuse ends here.

[Rowangreen]

It doesn't look too bad so far from what I can see in the pics.

You were right to loosen the medium, but changing it completely would probably be a good idea.

There's some red pigment on the edges of the leaves: that could indicate it's getting the maximum light it can stand. If you've got it somewhere bright you might want to pull it back a bit. But this could also be due to the treatment it got in the shop, and some phals naturally have more pigment in the leaves.

The roots might react a bit to change in environment. Better too dry than too wet in my experience, so don't worry too much. Keep a watch on the roots inside the pot: they should be going from green to silver before you water again. Don't worry too much about the arial ones.

The spots on the leaves could be due to it being watered and left wet when cold. They look quite old so I think that's probably down to the shop. Try and avoid watering in the evening.