As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPORT TASK: MAIN CABIN STA 324-345 LBL20 INTERCOSTAL HAS CORROSION ON UPPER SURFACE. TRANSCRIBED FROM HAECO GSO NRC 9282558 REPLACED INTERCOSTAL FR 324-345 PT # 141N5170U30 IAW BOEING DWG 141N5170 REV C AND B757-200 SRM 51-40-02. CREATED SDR #1028967 DOT Z561 REMOVED. HAECO GSO MECH V9325895 INSP QC295