As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALUMINUM LINE CORRODED FROM THE INSIDE AND WAS NOT DETECTABLE FROM OUTSIDE OF LINE. LEAK WAS NOTICED DURING FUELING AND AFTER MOVING THE LINE BY HAND, A STEADY STREAM OF FUEL STARTED TO LEAK OUT. IT IS POSSIBLE THE CROSSFEED NEVER GETS USED AND THE WATER BUILT UP IN THE LINE CAUSING THE CORROSION.