As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING M-CHECK, FOUND L1 DOOR SILL WEB TOP SURFACE SKIN CORRODED INCLUDING ADJACENT FLOORBEAM AT STA 365 & 377. CORROSION WAS ON FLOOR SUPPORTS NOT ON WEB. REMOVED CORROSION AREA IAW SRM 51-10-02 OUT OF LIMITS. RECEIVED NEW MATERIAL SUPPORT LOCATED AND DRILLED AND INSTALLED FLOOR SUPPORT IAW SRM 51-40-02.