As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED S4 STRUCTURAL/CPCP INSPECTION PER CARD S4 14108, FOUND CENTER WING UPPER REAR SPAR CHORD CORRODED, LBL 50 TO LBL 70 AND RBL 40 AT BS 870. REPLACED CENTER WING UPPER REAR SPAR CHORD PER BOEING MSG 9710012RR AND 970010TR.