As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION LEVEL: 2 CORROSION INTERNAL STRUCTURE BELOW CABIN FLOOR PANELS LOC APROX +Y1 732 IN PASSENGER CABIN AND FRAME 42+18. PERFORMED REPAIR INSTRUCTIONS ON INTERNAL STRUCTURE SIDE BOX LOC +Y1732 AND FRAME 42 TO FR 43 IN PASSENGER CABIN AS PER PRI #576371-14 REVISION O AND ER/A N.576371-14 REV ORIGINAL.