As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MX, CORROSION WAS FOUND ON A FLOOR PANEL ATTACH CHORD ADJACENT TO NUTPLATES. THE CORROSION WAS BEYOND MFG LIMITS AND THE DAMAGE CHORD REMOVED. FABRICATED NEW CHORD FROM EXTRUSION BAC 1506-1108 EXTRUSION. INSTALLED THE NEW CHORD SECTION IAW THE SRM. ITEM RETURNED TO SERVICE.