Reset bone positions

Hi Guys,

I have a set of face bones attached to a biped and when I load in some previously saved biped animation, the face bones position is moved to that of the data in the bip file. To fix I have to move each face bone back to it's original position, retaining the animation, but putting it at the correct position relative to the face.

I wonder if anyway would be willing to suggest/write a script that could do this process automatically?

Would be very grateful.