As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION FOUND ON STR 20L BETWEEN FS 319 AND FS 333. C-CHECK RO 12/24/2020. REMOVED CORRODED STRINGER 20L BETWEEN FS 319.00 AND 333.00 AND INSTALLED NEW SERVICEABLE STRINGER, IAW CRJ-700 SRM. REF ATTACHED TASK CARD AND M-337. NO CHANGE TO WEIGHT AND BALANCE.