Brown Spots and Yellowing Patches on Epi hybrid

[bobdave_]

I recently bought a few Epis and most of them were fine, but one of them has several yellow spots on newer leaves as well as a prominent brown spot on the newest leaf. I don't think it's any sort of rot or insects, but I don't really know how to identify or treat it if it is a bacterial/fungal/viral infection. Also, considering I just bought it, is this something I could contact the nursery for a refund or replacement? Any advice would be helpful.