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 FLOOR STRUCTURE CORROSION ON UPPER SHEET AFT IB LH SEAT TRACK BETWEEN FR85-86. FLOOR STRUCTURE ON UPPER SHEET AFT IB LH SEAT TRACK BETWEEN FR85-86 REMOVED AND REPLACED IAW EMB SRM 51-41-01 AND 51-43-01.