Yesterday I dropped my bag on the floor in a bus. However, inside the bag was my Xperia Z2. The phone was in the front pocket, but I don't remember whether the bag fell on the front or backside. The phone is equipped with a screen protector and a Sony style case. There weren't any scratches anywhere and the phone behaves normally. However, I am worried of any internal damage that might have happened that will show in the future. Any ideas how I can check whether everything is ok? Thank you.