As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) DURING SCHEDULED MAINTENANCE, THE FUEL COULD NOT BE TURNED OFF FULLY AND FUEL WAS CROSS-FEEDING. THE SELECTOR VALVES WERE REMOVED AND FOUND THAT THE SEALS HAD DISSOLVED. SUBMITTER SUSPECTED INCORRECT SEALS OR INCORRECT SOLVENT USED IN COMPLYING WITH AD/GEN/81.