As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION WAS DISCOVERED ON THE COVER PLATE COMMON TO A HAT SECTION INTERCOSTAL MEMBER AT BS 1020, LBL 0 TO LBL 24.5. CORROSION REMOVAL RENDERED THE COVER PLATE UNSERVICEABLE. FABRICATED COVER PLATE. CORROSION PROTECT AND APPLY SURFACE FINISH TO FABRICATED COVER PLATE IAW SRM 51-20-01. REINSTALLED IAW SRM 51-40-02.