As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED C-1 CHECK WHILE PERFORMING OTHER MAINTENANCE, FOUND THE DORSAL FIN LT LONGERON CORRODED AND WITH MULTIPLE CRACKS IN INTERIOR AND EXTERIOR, NEAR FS 836. REPAIR BY REPLACEMENT ACCOMPLISHED, IAW LOCKHEED SMP583 SRM, CH 51-60 & 51-70. NR 7001.