As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L4 DOOR CUTOUT LOWER SILL STA 1661+3" THRESHOLD SUPPORT CHANNEL CORRODED. REMOVED AND REPLACE THRESHOLD SUPPORT CHANNEL IAW SRM 51-40-02 AND DWG 146N8722 DUE TO CORROSION OUT OF LIMITS. FOUND CORROSION TO BE OUT OF LIMITS IAW SRM 53-00-51 FIG 101. (100% MATERIAL LOSS).