Brassavola with spots on leaves

[pjddjp]

Hello,
Here is a picture of a Brassavola nodosa. (I am only 90% sure that is the correct identification.)
Rather suddenly, I noticed the discoloration that is visible on the leaves in the foreground of the picture.
This is a bummer because, as you can see in the center, there is a flower spike. This plant is about 1 1/2 years old, and has never spiked before.
It is in a bark medium in a basket, so I doubt overwatering. Other nearby orchids do not have discoloration. It is in a very sunny south-facing window. The temps over the last few months have been 50-ish at night and maybe 10 degrees warmer in the daytime.
Possibly of interest, the day after I last watered, I noticed a drop of liquid at the top of the flower spike...this makes me wonder about overwatering, although as mentioned above, drainage is very good.
Any advice?
Thank you!
Danny