Maxillaria tenuifolia small plant yellow bulb

[silanah77]

Hello everyone,
I,ve just got a baby Maxillaria tenuifolia from our botanical garden here in my city-as you can see it is a small plant, one of the bulbs and the leaf above are yellow, so I don't know if I have to worry about it...? I don't have experience with such an orchid, I know they call it a coconut orchid, I' ve searched this group and I've read about the growing conditions. What are your recommendations- do I have to repot it? How often do I have to water it now during the winter? I put it on an east-north window. Thank you in advance!