7/7/2016. I took my 15" retina to the Genius Bar at the Grove where I bought it 3 years ago, as the pointer was jumping around. It would settle down sometimes, then would act up again. A readout showed that the extreme rhs of the pad was not functioning. Had to leave it. Could not open and fix it at home. Was told this was a unibody, and the entire top of the case needs to be replaced. Will cost me $310 plus tax, and 4 days. They sure don't want us to fool with it!