As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A NR3 AND NR4 INSP, CORROSION WAS FOUND ON SURFACE OF LWR LT AND RT FUSELAGE SKIN. IT WAS FOUND INSIDE THE COCKPIT BY THE PILOT`S/CO-PILOTS RUDDER PEDALS AREA, BEHIND THE TRIM PANEL. SKIN IN QUESTION ARE ONLY ALCLADDED, NO PRIMER OR PAINT WERE EVER APPLIED. THE SKINS WERE LOOSELY COVERED IN YELLOW FIBERGLASS INSULATION.