What was found
(CAN) DURING DEPARTURE OF THE ACFT PRIOR TO ENGINE START, FUEL WAS NOTICED LEAKING FROM NR 3 ENGINE. MX REQUESTED NORMAL ENGINE START TO VERIFY FUEL LEAK. ENGINE WAS SHUT DOWN, AND ACFT TOWED BACK TO GATE FOR FURTHER INVESTIGATION. THE FUEL HOSE ASSEMBLY WAS R&R WITH A SERVICEABLE ASSEMBLY. ENGINE GROUND RUN WAS CARRIED OUT AND LEAK CHECKED WITH NO FURTHER LEAKS OBSERVED. THE ACFT WAS RETURNED TO SERVICE.