As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE TECHNICIANS FOUND CABIN FLOOR STRUCTURE FRAME 89 WITH CORROSION AROUND A FASTENER HOLE RBL 38". FOUND TO BE OUT OF LIMITS IAW SRM 51-75-16. REMOVED AND REPLACED PANEL SUPPORT IAW SRM 51-40-08, 51-75-16 AND 53-23-10. A/C REMAINS IN HEAVY CHECK.