Sounds so simple. And you are correct. Just got back from the Genius Bar, they have to replace the entire top case because the R key tends to stick or misfire.

Sounds so simple. And you are correct. Just got back from the Genius Bar, they have to replace the entire top case because the R key tends to stick or misfire. 2 week repair because they don't have the parts. Sounds like an expensive repair for a single key. The person sitting next to me had the exact same issue (but different keys)!