Hi Zabeta,
Sap can often times be an indication of pests and it might be a good idea to treat your plant for mites and all other crawly things but there are also some orchids that seem to produce sap when they're happy. I remember watching a video on YouTube about this plant and the video host mentioned she can be very sappy. I wish I could remember the name of the video!
I just received one of these in blooming size. She was well wrapped in wet newspaper. A day or so after I unwrapped her and placed her in her home I noticed a bit of sap on her leaves. I can't imagine that a reputible orchid greenhouse would ship me a pest ridden plant so I chalked it up to her adjusting to new conditions. I gently cleaned the leaves with a bit of fresh lemon juice and water and the sap came off. If it comes back, I'll probably just leave it...and maybe spray for pests. Since this plant is deciduous, the leaves will fall off at the end of the season and the sap will be no more...until the next growth cycle
