I played Mario Kart 7 Thursday night and it was fine. I tried playing Mario Kart 7 about an hour ago and the L button was pressed in and wouldn't come up on its own. There was no "clicky-ness." I could lift it back up, but it just sticks if I press it.
I tried cleaning my 3DS even though it wasn't dirty and I don't use it with dirty hands. When I'm not using it, I leave it in the Club Nintendo pouch. I called Nintendo and ultimately, I was told that the system could be sent in to be repaired for $144. The warranty doesn't cover physical damage. I laughed then said, "No, thank you," before hanging up. I called back to ask why the cost was so high and they explained that they read it a bedtime story or something (in addition to repairing the damage, they do a full service check and its given a new 12 month warranty). They pulled up my Club Nintendo account and I ended up getting the price reduced to approximately $70. I'm pretty sure I could have held out for more because first they said they could drop the repair cost $35 then $50. I got it cut in half so I'll just deal with it.
I have no idea how this happened. I haven't dropped it between Thursday and today. There's a chance that I might not get my original unit back, but she made it sound like that would only be the case under extreme physical damage. Instead, I could end getting a blue refurbished 3DS which would be kind of lame considering how long I waited for the all black 3DS. All in all, a pretty crummy day. The lady I spoke to on my second call was nice albeit kind of scatterbrained. If nothing else, at least she wasn't being a dick.