As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A MAINTENANCE VISIT FOUND LONGERON 23L AT FS 550 FWD OF APU EXHAUST IS CORRODED BEYOND LIMITS. *** CORRECTIVE ACTION *** REMOVED, FABRICATED AND INSTALLED REPLACEMENT LONGERON SECTION PER DWG 5779912 AND DC8 SRM 51-1-20D AND 53-1-0