A classmate is offering to sell me his Early MacBook Pro Retina 15" for $300. The keyboard is sticky. (I would told that it's from a spill over a year ago.) Apple Diagnostics show no problem. I also ran Engine Heaven and Benchbench on it and it has no problem with those either. I remove the bottom case and check the all liquid submersion indicators (that I can see) and they are all white. Battery Cycle Count is 1011 and the laptop is showing "Replace Battery". The display has staingate. Should I buy it? Yea or nay?