As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD LOWER CARGO FUSELAGE STATION 549 RBL 6 THE STRUCTURE FOR THE LATERAL GUIDE NUTPLATES IS CORRODED. R & R 452T2704-1 INTERCOSTAL IAW DRAWING 451T2501 & SRM 51-40-02. R & R WEB FLOOR FS 522 - 549 RBL12 - LBL12 & INSTALLED LATERAL GUIDE AT FS 549 RBL 6 IAW DRAWING 143T5000 & SRM 51-40-02. LEVEL 2, LOC FROM FS 549 RBL 12 TO FS549 LBL12, PN 452R2704-1, PN INTERCOSTAL SUPPORT, SN NA. AIRCRAFT WAS GROUNDED.