[SatNews] "During the terminal count engineers observed drift on one of the two thrust vector actuators..."

NASA's posting yesterday regarding the upcoming launch of SpaceX revealed the 'sliver' of time available for the launch to succeed or not. 

"There is only an instantaneous launch window available, meaning that the blastoff must proceed at that exact instant. Any delays due to technical issues or weather would force a scrub until at least Friday, Jan. 9."

A technical issue became apparent causing SpaceX to scrub today's launch...

"During the terminal count engineers observed drift on one of the two thrust vector actuators on the second stage that would likely have caused an automatic abort. Engineers called a hold in order to take a closer look. SpaceX is scrubbed for today and we are now targeting launch on Jan. 9th at 5:09am ET."