As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, FUEL WAS REPORTED BEING DUMPED OUT OF THE LEFT WING DURING A LEFT TURN. ELECTED TO RETURN TO DEPARTURE. DECLARED AN EMERGENCY AND LANDED . FOUND LEFT PRESSURE RELIEF VALVE TRIPPED. R & R THE LEFT WING PRESSURE RELIEF VALVE IAW AMM 28-13, OPS AND LEAK CHECKED GOOD.