Problem in my friend's early 2011 macbook pro was unworking row of keys QWERTYUIO so I decided to figure out what was wrong there. 1. It was very dusty inside so heatsink was almost clogged and machine seemed to be very hot. I noticed heatsink sticked to keyboard black foil. But it wasnt that bad. 2. I removed keyboard (66 or so screws, yes) and disassembled it completely, every single key :-) 3. Next I took a close view on contact layer of keyboard and figured out what traces are responsible for non working keys and finally find a trace break! Im wonderin' how that break could happen, but it's a fact. There are at least 2 conductive layers separated by thin plasic layer, everything glued together so be careful when diggin' into... 4. Then I had to reestablish that trace so conductive paint was helpful. I used Mechanic MCN-DJ002. Looks kinda terrible but worked. Dont forget to check if you successfully fixed that via. Be careful, that factory traces are very fragile. 5. When my broken trace was fixed I...