As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CURRENT C CHECK, FOUND CENTER WING LOWER REAR SPAR WEB CORRODED AT LBBL66 TO 75. BLENDED CORROSION. PERFORMED HFEC OPEN HOLE INSPECTION AND SURFACE INSPECTION OF BLENDED AREAS. NO DEFECTS FOUND. MEASURED CORROSION DEPTH, MEASUREMENTS EXCEEDED SRM LIMITS. FABRICATED REPAIR DOUBLER AND FILLERS. INSTALLED DOUBLERS AND FILLERS .