As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION, HEADLINER WAS REMOVED FOR REPLACEMENT. FOUND CORROSION THAT WAS HIDDEN BY INSULATION MATERIAL. CORROSION WAS ON BOTH LT AND RT FUSELAGE ROOT RIB AND CORROSION ON RT DOOR OUTER JAMB (PN 1711030-4). CORROSION CONCENTRATED IN AREA WHERE FRESH AIR SCAT DUCTING ROUTES THROUGH ROOT RIBS. SCAT TUBING HAD DETERIORATED LETTING MOISTURE INTO CABIN ROOT RIB AREA. ALL PARTS WERE REPLACED WITH NEW FACTORY PARTS.