As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING REPLACEMENT OF LOWER SPAR CAP, WE WERE ADVISED THAT AN NEW AD IS PENDING AND WILL BE ISSUED IN JANUARY 2005 TO ADDRESS A CORROSION PROBLEM WITH THE PART NUMBERS. THE STRAPS WERE REMOVED AND EXTENSIVE CORROSION WAS FOUND UNDER THE STEEL STRAPS ON THE UPPER WING SKIN. THIS IS BEING REPAIRED AS PER TWIN COMMANDER'SINSTRUCTIONS AT A TWIN COMMANDER SERVICE CENTRE.