Can you retrain your favored class?

[Ferka]

I know the original rules on favored class say the following:

Favored Class
Each character begins play with a single favored class of his choosing—typically, this is the same class as the one he chooses at 1st level. Whenever a character gains a level in his favored class, he receives either + 1 hit point or + 1 skill rank. The choice of favored class cannot be changed once the character is created, and the choice of gaining a hit point or a skill rank each time a character gains a level (including his first level) cannot be changed once made for a particular level. Prestige classes (see Prestige Classes) can never be a favored class.

However, this predates the retraining rules. Has anything changed the above to allow you to retrain your favored class and/or the bonus choices you make at each level?

Thanks!

[Corbin Dallas]

I see nothing in the retrain rules that would allow you to change your favored class.
One corner case might be created with a first level character retraining first level. The GM probably would have to make a judgment on that.