What was found
DURING WALKAROUND, FOUND #2 ENG FUEL LEAK. ACCOMPLISHED ENGINE VENTS & DRAINS INSPECTION REF B737-900 AMM 71-11-00 FOUND FUEL LEAK AT MAIN OIL/FUEL HEAT EXCHANGER PAD DRAIN APPROX 60 DPM. GROUNDED - YES. REMOVED AND REPLACED MAIN OIL/FUEL HEAT EXCHANGER AND SERVO FUEL HEATER IAW B737-900 AMM 79-21-02 AND AMM 73-11-07. OPS CHECKS OF MAIN OIL/HEATER EXCHANGER AND SERVO FUEL HEATER GOOD. LEAK CHECK FAILED AT SERVO FUEL HEATER ITEM 23 GASKET OF AMM 73-11-07-000-801-F00. INSTALLED NEW GASKET AND BOLTS ON FUEL TUBE FROM HMU TO FUEL SERVO REF AMM 73-11-07. OPS CHECKS GOOD, NO LEAK NOTED.