Is my Vanda ill?

[Izobel]

Hello everyone!

I got a Vanda as a present a few days ago. I love it already, but something bothers me. The stem is quite brown at some places and a few leaves seamed to drop before I got this Vanda. I can also see black spots on the stem itself, see the photos. Now I read that Vandas can get a stem rot, caused by a fungus. Does my Vanda has this pest and what can I do about it? The roots and flowers look fine. The Vanda hangs near a few Phalaenopsis, could a disease be contagious?

Thanks a lot!
Izobel