As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION FOUND AFT OF STATION 977 IN LT WW CTR BEAM. BLENDED CORROSION ON LT KEEL BEAM OTBD FLANGE STATION 958 - 977 AREA BLENDED FOUND TO BE OUT OF LIMITS IAW SRM 53-50-12. SEE REA B653-60856-MR FOR COMPLETION OF REPAIR. SDR INFORMATION CORRODED, PN 145T8611-5, SN, PART NAME KEEL BEAM, FUSELAGE STATION FROM 958 TO 977. ACFT WAS GROUNDED.