Does anyone know what the update is accomplishing on the GNS-400?

[duttoncpa]

We were just notified that the aircraft with the GNS-400 must go to a Garmin service center for an update.  Anyone know what they are updating?

[a2capt]

http://garmin.blogs.com/aviationalerts/2013/11/service-alert-0936-rev-b-navigation-error-condition-concerning-terminal-procedures-with-direct-to-fi.html