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 HC5711, FOUND THE LT INBOARD FLAP LOWER SURFACE CORRODED AT CWS117.3-173.3L, 13" FROM THE FORWARD EDGE. REPAIR BY REPLACEMENT ACCOMPLISHED, IAW LOCKHEED SMP583 SRM, CH 51-60 & 51-70 NR 1000306394.