As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUXILIARY TANK GASKET REPLACED AT FUEL TANK CHANGE. RADIAL CRACKS DEVELOPED CAUSING FUEL LEAK. GASKET REPLACED WITH NEW. NEW GASKET FAILED IN SAME MANNER. CRACKS STARTED AT ALL SCREW HOLES IN GASKETS. REPLACEMENT GASKETS WERE WHAT APPEARED TO BE NEOPRENE. ORIGINAL GASKET WAS CORK.