Is something wrong with my Sedirea Japonica?

[3rdMaestro]

I have recently moved my Sedirea japonica outside because I read it needs/can handle cooler temps in the fall and winter, but now one of the leaves (the lowest one) is turning yellow and I noticed several brown spots on the underside of the top most leaf. I know the topmost leaf had a spot when it arrived about a month ago, but I don't recall several spots. Is something wrong? Can it be fixed?
Currently it receives about an hour or hour and a half of exposure as the sun rises in the morning, then the porch overhang provides shade the rest of the day. Temperature is about high 70s in the day and 60 to mid 50s at night. (In case it's a cultural problem)