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 PASSENGER CABIN FLOOR STRUCTURE, CORROSION FOUND AT RH SHEAR PANEL BTW FR87-88. CENTER FUSELAGE III PASSENGER CABIN FLOOR STRUCURE BTW FR87-88, RH SHEAR PANEL REPLACED IAW E-170 SRM 51-42-01 & 51-42-04. A/C REMAINS OUT OF SERVICE FOR HEAVY CHECK COMPLETION.