What was found
(CAN) LEAKING FUEL INTO THE ENGINE NACELLE WAS FOUND AFTER THE MECHANIC CHANGED THE FUEL FILTER COVER O-RING IAW MM 73, SECTION 73.10.02. AT FIRST, THE MECHANIC THOUGHT HE HAD OVERTORQUED THE FUEL BOWL BUT AFTER REPEATING THE PROCESS AND USING A BOROSCOPE TO VIEW ALL AROUND THE MATING SURFACE THERE IS NO EVIDENCE THAT THE SEAL IS BEING NIPPED WHEN TIGHTENED. THIS IS THE 6TH TIME HE HAVE DONE THIS PROCEDURE AND NO MATTER WHAT TORQUE HE USED THE OUTCOME IS ALWAYS THE SAME WITH A FUEL LEAK IN THE SAME PLACE. THREADS AND MATING SURFACES WERE INSPECTED FOR ANY SIGNS OF DAMAGE BUT IT IS FREE OF ANY BURRS OR SHARP EDGES. TROUBLESHOOTING IS ON-GOING.