As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE INSPECTION NEAR THE MAIN HYDRAULIC MANIFOLD, A LARGE OF INSULATION MATERIAL WAS NOTED. FURTHER INVESTIGATION REVEALED THE INSULATION WAS FROM THE OUTER COVERING OF THE MUFFLER. CRACK WAS FOUND AT THE TOP OF THE MUFFLER P/N 12945-096-001.