As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL OBSERVED DRIPPING FROM DRAIN LINE AFTER GROUND RUN OF ENGINE WITHOUT HEATER BEING USED. VALVE WAS REMOVED FROM AIRCRAFT AND 30 PSI SHOP AIR WAS APPLIED TO INLET WITHOUT POWER TO OPEN VALVE. LEAK CHECK FLUID WAS APPLIED TO VALVE BODY AND LEAK WAS FOUND TO BE COMING FROM UNUSED MOUNTING HOLE ON VALVE BODY. (X)