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 HVY CHECK, MAINTENANCE FOUND LEVEL 2 CORROSION AFT WET AREA GUSSET PLATE AT FR 90. THEY REMOVED AND REPLACED FLOOR GUSSET PLATE IAW SRM 51-41-02. AIRCRAFT REMAINS OUT OF SERVICE FOR HVY CHECK COMPLETION.