As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AWR HIDDEN CORROSION: CORROSION WAS FOUND ON LONGERON 22L FROM STA Y=1331 TO Y=1333 IN AFT CARGO COMPARTMENT DURING REPAIR OF AFT LAVATORY SERVICE PANEL REF NRC S/N 00051. LEVEL CORROSION 2 DAMAGE LONGERON WAS REPAIRED (PERMANENT REPAIR) PER SRM 53-02 FIG 18.