As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE WIRING THAT PASSES THROUGH THE NOSE RIB GROMMETS HAS WORN TO THE EXTENT THAT THE INSULATION IS GONE AT PLACES CAUSING THE METAL CONDUCTOR TO SHOW THROUGH. IT APPEARS THAT THIS IS WORSE WITH THE GREATER AMOUNT OF CABLES IN THE BUNDLE. BUNDLES OF ONLY 2 WIRES DO NOT HAVE THIS PROBLEM. APPARENTLY THE BUNDLE IS (SLAPPED) UP AND DOWN WITH VIBRATION. THIS IS CAUSE FOR CONCERN DUE TO SPARKING NEAR THE FUEL TANK.