I have two keys not working due to liquid damage which happened 3 years ago. Looked at iFixit and youtube and seems like a job that can be done easily. Looked at eBay and have a few keyboards available for my model and are only $23 or so. Anyone did this by themselves and have found issues that are not discussed on iFixit? This is Mid 2011 Mac Air 13", not worth taking to apple which charges an arm and a leg for an older laptop and this is an hand-me-down for free.