When did FX leave the team?
http://www.pettersolberg.com/html/team/
Here says Francois Xavier DEMAISON is the chief engineer of PSWRT.
And this video of WRC.com
http://www.wrc.com/jsp/index.jsp?lnk...0Differentials
Citroen Junior Team Engineer Francois Xavier Demaison (FX) explains the function of differentials