Repairing the spar is possible, but you may want to let a professional do
this. I know a composite repair specialist in Atlanta named Greg Kress that
does this for a living for Delta. He flew out on a spar repair for a
composite aircraft close by us. He made the pre-made auto-claved tapered
part made from the same modulus and ratio (carbon to epoxy) as the part he
was fixing and installed it and left a book full of FAA paperwork certifying
that the spar was once again airworthy with all of the computer
calculations, etc, etc . He is one of 3 people at that time certified by the
FAA to do this kind of repair on airliners and has a masters degree in it! I
think he charges ~$1800 for everything.

I can look him up for you if you are interested.

Scott