Hi, My Macbook Pro late 2013 (13inch, Model: A1502) has developed a protuberance at the back and an Apple Store (Genius Bar) technician told me that this is a result of "excessive pressure" on the soft aluminium bottom case, resulting in an internal bracket causing an internal dent. There hasn't been an accident, I surely haven't stepped or sat on my laptop, the only pressure I can think of is when carrying it inside a padded pouch, inside a high quality, laptop-grade double-padded backpack, i.e. under normal everyday use. This is only a cosmetic issue and can be easily repaired by replacing the back plate (it costs about £90 in the UK), but how excessive is the "excessive" pressure that caused this? Should this happen? After a bit of research, I think it is a weakness of the device, a design issue. I've explained my findings (so far) and included a photo here: https://discussions.apple.com/thread/6876250 I'd be grateful if other users who may have experienced the same problem -under normal everyday use- come forward and share their experience. Kind regards.