Hello everyone, A couple of weeks ago I've purchased a used MBP 13" 2015 for 700€ (which is a good price where I live) in excellent exterior conditions. While I was trying it, I had noticed that a couple of keys were a bit strange (nothing major anyway), but the seller told me that it probably was just some dust and I stupidly trusted him (I was in his own house, so he looked trustworhty to me). After some time I've tried cleaning the keys with compressed air, but it didn't work, so I've searched a bit online and I finally decided to try to remove the single keys... Just to discover, sadly, that the were some clear liquid (now evaporated) marks under them. I've decided to bring the mac to an Apple Store asking them to check inside and yesterday they called telling me that there were signs of liquid on the logic board, SSD and keyboard. I was quite furious and I immediately called the seller, but he told me that he never spilled any liquid on it (what a liar) and that he doesn't see the problem since the macbook is working just fine. The macbook is actually working great, the genius at the apple store has even launched the advanced diagnostic test and he didn't find any issue, but I know it could fail sooner or later. The only way not to lose my money is to sell it as "functional", but I'm not going to do that since I'd be a d*ck and a liar just as much as the guy who sold it to me. So the only real options are: bring it to a third party shop (but I'm a bit scared since I know I could not 100% trust their repair) or sell it as "fully functional, but liquid was spilled on it". I feel so dumb and stupid right now.. What should I do in yout opinion?