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 LT LONGITUDINAL BEAM AT FR 87. CENTER FUSELAGE III FLOOR STRUCTURE LT LONGITUDINAL BEAM AT FR 87 REPAIRED, IAW SRM 53-23-10 PAR 6. A/C REMAINS IN CHECK.