As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE C CHECK INSPECTION, CORROSION AND CRACKS WERE DETECTED ON INTERCOSTALS BETWEEN FUSELAGE STATION 520 AND 560, LONGERON 33 RIGHT. REPAIR ACCOMPLISHED REMOVAL OF DAMAGE AREA, FABRICATION AND INSTALLATION INTERCOSTALS IN ACCORDANCE WITH DOUGLAS DRAWING 5616520 AND ENGINEERING ORDER 53-DC8-1762.