Next steps in the road to recovery for Phal

[andrew__]

I have a phal which has been going downhill for what had seemed like no apparent reason... The leaves were looking like the plant was short on water so I gave it a quick watering and noticed that water was draining really slowly. Re-potted it today and found it was only potted in dense moss! All roots except a few that were above the moss were rotted and have been removed. I know I need to be very careful with watering at this point but what exactly should my routine be at this point? The roots it has are thick and healthy. Should I treat it like I would a normal phal or maybe give it less water? Just looking for tips on how to get this thing growing again instead of going downhill like it has been.

And so this thread isn't completely boring here's a picture of this orchid before its decline :