As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON UPPER SURFACE LOCATED RIB 12 +24 STR 8 RT WING. PERFORMED PERMANENT REPAIR ON UPPER SURFACE LOC RIB 12 +24 STR 8 ON RT WING IAW EA 57-0365-19 CAT B IAW RDAS 80664047/109/2019 EC A19 627-07 REF NR 2019-258095.