As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
***CORROSION*** ACB INTERCOSTAL BS 747-767 RBL 22 WL 156 / CORROSION ON INTERCOSTAL WAS FOUND TO BE OUT OF LIMITS DUE TO PROXIMITY TO FASTENER HOLES PER: SRM 53-00-04-1A-1. INTERCOSTAL IS A PART OF THE 146A7502-51 ASSY AND WAS REPLACED ON NRC U287962