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 PASSENGER CABIN FLOOR FRAME 90+5" RBL 10" FLOOR SUPPORT CORRODED AT FASTENER HOLE. BLENDED CORROSION AND FOUND TO BE OUT OF LIMITS IAW SRM 51-75-16. REPLACED SUPPORT 170-60297-001 IAW SRM 53-30-10 AND SRM 51-40-08. APPLIED TOPCOAT IAW AMM 51-24-06.