As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LANDED BACK TO THE BASE, DUE TO FUEL LEAKAGE FROM FUEL CAP INTO THE CABIN. ON ARRIVAL FOUND SIGN OF FUEL LEAKAGE AT AFT TANK CAP TO THE ADJACENT PAX DOOR INTO THE CABIN. AFT TANK WAS FULL ON DEPARTURE, SUSPECT FUEL SEEPAGE FROM THE TANK CAP DUE TO SEAL WAS NOT IN GOOD CONDITION. TANK CAP REPLACED.