What should I do with this Phal orchid?

[supersheep]

Ok, so here's the backstory. This Orchid I got a few months before Christmas and it had lovely flowers. It's a Phal I got from a supermarket. They dropped off after about a month, so I cut back the flower stem. A couple of bottom leaves then went yellow and fell off.

I checked the roots and they were getting very black and mushy - it was in a very mossy medium. So I repotted it in a mainly bark orchid compost and cut away the bad roots. There wasn't much left after that, but a few aerial roots seemed ok, so I put them inside the potting medium when I repotted.

That was about a month ago, and it's not been very happy since! The leaves are now drooping quite a lot and I tipped out the potting medium to check on the roots. They're a bit blackish in places, green in others. They've broken a bit, but aren't mushy or anything.

The other week, seemed to be a bit of mould on the crown, so I dusted it with cinnamon powder. The mould hasn't come back, but I am getting rather worried about the leaves!

Ok, so now, I'm not sure what to with it! I'm worried about repotting it again in case the two remaining roots rot. And whether it needs more or less water...

And with the leaves, I'm not sure if they're getting dehydrated or not?

What do you recommend I do? Repot or try something else? I've tried searching the forums, but I'm still not really sure what to do for the best.

Pictures below

Thanks so much!