Hi! My fiancé is looking at buying a used early-2015 MacBook Air 13.3" with liquid damage. The owner had it "cleaned and restored" at a non-authorized repair place. It apparently powers on and charges normally, but the backlight doesn't work. She said t would take $300 to cover the part to potentially fix it. She's selling it for $150. So I'm wondering what part it is that probably isn't working and how easy it would be to fix. My tech savvyness goes as far as following iFixit to open up my cMBP to fiddle with the hard drive and opening up my fat PS3 to clean it.