As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY MAINTENANCE PERFORMING INSPECTION IT WAS NOTED THAT THE INTERCOSTAL WEB AT BS 490-510 STR 28R HAS CORROSION. REMOVED INTERCOSTAL AND FABRICATED ANGLE FROM 7075 T6 DIM 18.5". INSTALLED INTERCOSTAL AND FABRICATED ANGLE IAW B727 SRM 53-10-2, 51-30-5. NO OTHER DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.