As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND DURING C-CHECK, CORROSION ON TOP FLANGE OF INTERCOSTAL AT LBL10.0 BETWEEN FRAMES AT STATIONS 236.5 AND 258.0 BELOW FLOOR AREA. REFER TO CELSIUS W/0 193,TASK 1509. MAINTENANCE REMOVED CORROSION OUT OF LIMIT FROM TOP FLANGE OF INTERCOSTAL. FABRICATED NEW FLANGE IAW SRM 51-20-42/43. APPLIED TOPCOAT AND INSTALLED WET SEALED IAW SRM 51-20-41.