As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER THE ENGINE WAS REINSTALLED IN LEFT SIDE OF AIRCRAFT AND A GROUND RUN WAS COMPLETED, A FUEL LEAK WAS NOTED AT THE FUEL CONTROL FUEL PUMP MATING SURFACE. UPON DISASSEMBLY, FOUND O-RING WAS NOT INSTALLED. INSTALLED NEW O-RING, AND REASSEMBLED. GROUND RUN AND LEAK CHECK WAS SATISFACTORY. NOTE: ENGINE WAS REMOVED FOR ITT HARNESS CHANGE ONLY.