N591MA Diverted

I was wondering if anyone at Dulles Airport knows why 591MA diverted there enroute from TEB- to Mississippi. I work for the charter company it flies for and was wondering if it was a pressurization problem or what not?

Flightaware ](Live Flight Tracker - FlightAware) filed TEB-CKM, diverted to IAD, note normal decent.
FAA registry](http://registry.faa.gov/aircraftinquiry/NNumSQL.asp?NNumbertxt=591MA) N591MA Citation XLPHOTO](http://myaviation.net/search/photo_search.php?id=01011287) N591MA
Malone Air Charter](http://www.maloneaircharter.com/dev/)website. At present I’ve not found any potential reason for the diversion??? I like the website, you can click on any aircraft and Flightaware pops up!