As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 4Y/2Y CHECK IN BNA FOUND CORROSION IN LT AISLE FLOORBOARD FLANGE AND RISOR AT STA 294 EXTENDING AFT APPROX 10 INCHES. REMOVED CORROSION OUT OF LIMITS. REMOVED DAMAGED SECTION AND INSTALLED NEW SECTION AND SPLICE. REF MESABA EO S53060 REV 3.