Just curious if there's any info on this issue in Star Trek: Into Darkness since it wasn't explained in the movie. How did Khan know that the Enterprise warp core had problems? Was there some document from Section 31 (or whatever that secret MI-5 type Starfleet organization is called) that Khan might have come across where this type of sabotage is their M.O.?
I know it wasn't explained in the movie but maybe there's some sort of answer from the Star Trek universe I haven't read/found yet.