As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND SEVERE GALVANIC CORROSION BETWEEN THE AILERON ATTACH BRACKETS AND REAR SPAR IN SEVERAL LOCATIONS. STEEL HAD ORIGINALLY BEEN CADIMUM PLATED. THIS WAS CRITICAL AS IT COULD ALLOW THE AILERON TO DEPART THE AIRPLANE. COULD NOT FIND A PN IN THE CATALOG AS THIS IS CALLED THE REAR BEAM ASSEMBLY. THE REAR AILERON ATTACH POINTS ARE REINFORCED WITH STEEL PLATES. THE CORROSION WAS LOCATED BETWEEN THE PLATES AND THE ALUMINUM BEAM. (GL19200404422)