As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION, FOUND CORROSION ON SHEAR PLATE IN AFT CABIN FLOOR STRUCTURE LOCATED FR 69 AND FR 70 AT LEVEL STR 23L. MEASURES APPROX: L=3"; W=2"; D=0.003". REPLACED SHEAR PLATE LOCATION BETWEEN FR 69 AND FR 70 AT LEVEL STR 23L AFT CABIN FLOOR STRUCTURE SRM 51-42-11.