As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THESE FIREWALL DOULBLERS ARE INSTALLED FROM FACTORY WITH SOME STRUCTURAL STEEL RIVETS PASSING THROUGH THESE ALUMINUM DOUBLERS, CAUSING CORROSION TO FORM ON BOTH LT AND RT DOUBLERS VERY NEAR ENGINE DYNAFOCAL MOUNT LOCATIONS, REQUIRING REPLACEMENT OF BOTH DOUBLERS.