As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE INVESTIGATING A PROBLEM OF FUEL IN THE CABIN, AN AREA OF SEVERE CORROSION WAS FOUND. THE CORROSION WAS LOCATED IN A STRINGER UNDER THE AILERON BELLCRANK UNDER THE AFT CABIN FLOOR. THE CORRODED STRINGER IS IN THE SAME LOCATION OF A SIMILARLY CORRODED STRINGER FOUND ON AN S550 AIRCRAFT, 5500024. SUBMITTER STATED IT SHOULD BE NOTED THE AREA IN QUESTION IS NOT EASILY SEEN. (X)