As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON THE REMOVAL OF THE AFT CARGO LOWER THRESHOLD BEAM, SEVERE CORROSION WAS FOUND AT STATION 1210 LONGERON 28 RT ON INNER DOUBLER. THE CORROSION WAS MECHANICALLY REMOVED LOCALLY, A 63RMS SURFACE FINISH MAINTAINED AND MFEC SHOWED NO CRACKS. THE AREA WAS CORROSION PROTECTED PER DC9 SRM CHAPTER 51 AND TOP COATED WITH WHITE EPOXY PAINT.