POP is right, there was a bad batch of pulleys in 2009. The problem was known since about March 2009 but by then most people already bought their kites. Since then the problem was fixed on the 2010 and subsequent models. If it's any consolation apparently only a small percentage of kites was affected, so not everyone will have this problem.
However the important point to know is that if one pulley broke, the others on the same kite were from the same bad batch and more pulley failures usually followed. So if you had a pulley failure on a 2009 cab then its best to follow POP's recommendation and change all of them,
rather then risk wasting more sessions

(not to mention getting injured

).