As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING P4-LAS SCHEDULED C-3 CHECK UNDER JOB CARD HC5314, FOUND THE FS 577 UNDERFLOOR BULKHEAD UPPER CAP CORRODED BENEATH THE LBL 40 ANCHOR NUTS, WL 146. REPAIR BY REPLACEMENT ACCOMPLISHED, IAW LOCKHEED SMP583 SRM, CH 51-60 & 51-70 NR 1000303154.