As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN L4 DOOR UPPER SILL MOUNTING PLATE IS CORRODED, BS 1665, LBL 63. REMOVED CORROSION AND FOUND AREA TO BE OUT OF LIMITS WITH 100 % MATERIAL LOSS IAW SRM 51-10-02 & 53-60-15. REMOVED SUPPORT IAW SRM 51-40-02. LOCATED AND DRILLED NEW FITTING SUPPORT IAW SRM 51-40-05 AND DWG 146N8722 REV N. INSTALLED A NEW SUPPORT IAW SRM 51-40-02 & DWG 146N8722.