As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION FOUND MAIN E&E BAY AVIONICS EXHAUST PORT CUTOUT INTERNAL DOUBLER IS CORRODED IN SEVERAL AREAS WHERE DUCT MOUNTS TO FUSELAGE. MAINTENANCE REMOVED CORRODED DOUBLER FOR AVIONICS EXHAUST PORT CUTOUT AND FABRICATED, INSTALLED NEW DOUBLER IAW SRM 51-40-02 AND DWG 143A3233.