Have you tried any of the antifungal/anti bacterial products. Also need to look at the media you are using. In one foto it looks green, is that moss. If so dump it yesterday. Use an orchid bark mix. I know you have extension agents where you live and I would bring the plant in for a diagnosis. I could also be viral. Hard to tell unless you look under a microscope. Try googling orchid diseases and see what you can find. If it is viral the plants will have to be dumped. You could also contact Hauserman and see what they have to say. You also didn't say over what period of time this occurs. Viruses tend to be pretty swift in their progression, at least that has been my experience. I'm sure there are other folks on this forum that may have more experience that can help you. Hang in there.
In any case I wish you luck.