Coffee and MacBooks is not good. A coffee soaked logicboard starts to grow corrosion in a matter of hours. It is very important with coffee spills to clean the logicboard immediately. If your MacBooks has had an encounter with coffee, get it to us fast. If it is possible for you to remove, or unplug the battery do it. A logicboard with power can in many cases corrode worse than if the battery is unplugged.