That was my thought too-sunburn and the white dots, some fungal or bacterial infection. What other orchids did you have in the west window? Phals don't like a lot of direct light. If the leaves feel warm to the touch, it is too much.
You could treat the leaves with something like Physan if you have it. Otherwise possibly wipe them down with some hydrogen peroxide of brown Listerine. If they get wet or soggy I would try and remove the bad parts with a sterile blade and put cinnamon on the cut ends of the leaf to seal and disinfect them.
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