As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SURFACE CORROSION FOUND AT BS 1997, BETWEEN LONGERON 50R AND LONGERON 49R IN THE AFT FUSELAGE COMPT. REMOVED THE CORROSION IAW SRM 51-21-01. ORIGINAL METAL THICKNESS WAS 0.071 IAW DWG AJC 7363. AFTER CORROSION REMOVAL THERE WAS 100% MATERIAL LOSS WHICH IS OUT OF LIMITS IAW SRM 53-00-01 VOL I FIG 1B. FABBED A NEW SHEAR TIE IAW DWG AJC 7363. INSTALLED SHEAR TIE IAW SRM 51-33-01.