As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BATTERY RIB AT WS53.60 HAS CORROSION ON THE INBOARD SIDE OF THE UPPER ANGLE AT RADIUS (MARKED). C-CHECK RO 9/1/2020. REMOVED CORROSION ON LT BATTERY RIB AT WS53.60, REF. CRJ200 SRM. REMOVED UPPER REINFORCEMENT ANGLE AND HI LITES TO FOM, REF. CRJ200 SRM. & INSTALLED UPPER REINFORCEMENT ANGLE REF MHIRJ REO.