As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE. CORRODED AREA AT LOWER SILL BETWEEN FR 66 TO FR 68 LEFT SIDE AT LEVELOF STR 23L MEASURING L=0.736 INCH; W=0.562 INCH; D=0.054 INCH. PERFORMED PERMANENT REPAIR ON LOWER SILL, IAW A321 SRM 53-41-14-300-001 PRINCIPLE 7.