As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE A/C WAS OUT OF SERVICE FOR HEAVY CHECK. CENTER FUSELAGE III FLOOR STRUCTURE OF PASSENGER CABIN, CORROSION FOUND ON GUSSET PLATE BTW FRAME 85-86 LBL 12 AREA. ON CENTER FUSELAGE III FLOOR STRUCTURE OF PASSENGER CABIN GUSSET PLATE REPLACED IAW SRM 51-43-04. A/C REMAINS OUT OF SERVICE FOR HEAVY CHECK COMPLETION.