What was found
CORROSION, RT INBOARD INTERCOSTAL HAS CORRODED FASTENER, AS MARKED FR 87. C-CHECK RO: 11/20/2020. REMOVED AND REPLACED RT INBOARD INTERCOSTAL (AFT WET AREA BEAM) AT FR 87 WITH NEW PART FROM FACTORY. NO SIGNIFICANT CHANGE TO WEIGHT AN BALANCE. APPLIED TOPCOAT AND CIC TO NEW BEAM, REF EMB175 SRM.