Camping in Seattle, my laptop got quite damp in a backpack without my realizing. It was wet for a few days, I noticed and dried it out the best I could, I opened it up and let it air dry for a day. When I booted it up that evening, the keyboard and everything worked fine. The next morning, I went through TSA, the keyboard stopped working when I got home and tried to boot it up again. I tried to continue drying it out, and it somewhat worked again for a small period, but it's stopped working once more.
Also, somewhat related, the CPU fan is locked at 100% all the time. The laptop is still usable with the touch screen and USB ports, but it sorta defeats the purpose if I can't use the keyboard.
I don't know if the keyboard on these can be replaced, but I'd be very interested if they could be.