As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A C-CHECK, THE RT FLOOR SUPPORT WEB AT FS 559.112 TO FS 605 WAS FOUND TO BE CORRODED BEYOND LIMITS. MAINTENANCE WILL DETERMNE THE APPROPRIATE REPAIR UPON FURTHER INSPECTION ON THE RT FLOOR SUPPORT WEB AT FS 559.112 TO FS 605. THIS MRR WILL REMAIN OPEN PENDING THE APPROPRIATE CORRECTIVE ACTION. (K)