Advice about Vanda Orchid

[lerera]

Hello everyone,

I was wondering if someone with experience can give me an advice regarding Vanda's root trimming.

I've recently purchased a vanda- "mimi palmer", it's a mature plant. The stem of the plant in the bottom seems to be dry and also the roots in the bottom seem drying up. The roots that grow above it look normal and they are thick and green. I added some pictures to demonstrate it.

Does anyone know if I can trim the bottom part of the stem (at the level of the red line) and that won't harm the plant, given that he has several roots above this point...?

Thank you for all you help!