As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER REMOVAL OF CHORD AT L/H SIDE STA 727 STR 18A FOUND PITTING CORROSION ON INTERCOSTAL MATTING SURFACE AROUND FASTENER HOLE. REF AAR N/R 9937649. REMOVED AND REPLACED INTERCOSTAL AT STA 727 STR 18A AS PER B737-800 SRM 51-40-02-0G-0 AND DWG 146A0062.