OLPC headquarters had a repair workshop and presentation to show people how to tear down XO laptops and rebuilt them from the motherboard up. They taught XO users how to break down and rebuild one in under half an hour, with nothing but a Phillips screwdriver!
Now you can watch their repair session in this fun video:
Note that they mainly used XO-1 laptops, since these are still the most common XO laptops. Those with XO-1.5 will see their repair efforts to be much easier - for instance, the XO-1.5 keyboards just pop out.