Kathy, I would think we are talking about this one:
http://cubits.org/orchids/thre...
http://cubits.org/orchids/thre...
http://cubits.org/orchids/thre...
http://cubits.org/orchids/thre...
etc etc
Lee, please do correct me if I am wrong.
I like Janice's advice re-potting into fresh mix. And - I would get that plant (slowly so you don't burn it) acclimatized to full sun ( especially now in Winter)/ growing without sheer curtains. Also fertilizing might be a good idea every so often.
The replacement plant might also be happier in brighter light condition.