As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CURRENT HMV, HEAVY CORROSION WAS FOUND ON THE FS 1640 FLOORBEAM UPPER CHORD. DUE TO SEVERITY OF CORROSION, AND OVER 50 PERCENT REMOVAL OF THICKNESS OF FLANGE, UPPER CHORD WAS CUTOUT AND A MANUFACTURER APPROVED REPAIR INSTALLED, FULL UPPER CAP REPLACEMENT. THE REPAIR IS DOCUMENTED IN ER/A 472914-14.