As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK MAINTENANCE FOUND CORROSION ON CENTER FUSELAGE III FLOOR STRUCTURE LH PANEL SUPPORT AT FR90. CORRODED FLOOR STRUCTURE LH PANEL SUPPORT AT FR 90 OF CENTER FUSELAGE III REPLACED WITH NEW AND INSTALLED IAW SRM 51-41-01 AND 51-43-03.