Newbie has a Cattleya with Spots

[labyrinth1959]

I purchase a Cattleya from Lowes and when I inspected it at home I found it had numerous small black spots on/in its leaves. I found no evidence of pests on the plant. My question is what if anything should I do to treat the plant. I don't what to return it, but rather hope to gain some experience with it. I have attached some pictures to demonstrate the problem.