As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOWER TANK SKINS CORRODED THROUGH IN STRAINER ASSEMBLY SUMP. CORROSION NOTED IN OTHER AREAS OF TANK LOWER SURFACE CONSISTENT WITH STANDING BEADS OF WATER. CORROSION NOTED AROUND FUEL DRAIN VALVE PAD. STRAINER ASSEMBLY SUMP IS LOW POINT IN THE TANK AND HAS NO PROVISIONS FOR DRAIN. BOTH LT AND RT TANKS AFFECTED. AIRCRAFT INACTIVE FOR ABOUT A YEAR.(AL03200409911)