As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION INTERIOR OF THE AFT 437BR ACCESS AFT UPPER CORNER, NEAR THE AFT HINGE OF THE LEFT ENGINE NAC STRUT AFT FAIRING. CORROSION WAS BLENDED OUT OF LIMITS, REPLACED THE UPPER ANGLE IN THE HYDRAULIC BAY IN ACCORDANCE WITH SRM 51-40-02 SECTION 7. AIRCRAFT GROUNDED.