As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOTS REPORTED THAT FUEL TRANSFERS BETWEEN FUEL TANKS WITH THE FUEL SELECTOR IN OFF POSITION. DISCOVERED WHEN LOOKING FOR A FUEL LOAD THAT SOMETIMES ONE TANK HAD MORE FUEL THAN OTHER. SEALS BYPASSING FUEL INTERNALLY. FUEL SELECTOR REPLACED WITH NEW.