As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS LEADING EDGE SUPPLY LINE FOR TKS DE-ICE FLUID WAS FOUND CHAFED APROXIMATELY 90 PERCENT OF WALL THICKNESS BECAUSE OF IMPROPER ROUTING THROUGH A PROTECTIVE PLASTIC TUBE. AS THE SUPPLY LINE EXITED THE PROTECTIVE TUBE IT WAS RUBBING ON THE AFT INBOARD EDGE. THE CHAFING OCCURRED AT THAT POINT.