As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON WALKAROUND FOUND FUEL LEAKING FROM #2 ENG BOTTOM DRAIN MAST AREA. GROUNDED - YES. RAN #2 ENG AND ACCOMPLISHED B737-900 AMM 71-71-00-200-801-F00, ENG VENTS AND DRAINS INSPECTION FOUND FUEL DRIP FROM MAIN OIL/FUEL HEAT EXCHANGER AND DRAIN TUBE, WITHIN LIMITS PER LEAK LIMIT TABLE (FIG 605). TO BE REPAIRED WITHIN 25 FLT CYCLES. CN 04033468. REMOVED AND REPLACED #2 ENGINE MAIN OIL/FUEL EXCHANGER REF AMM 79-21-02. OPS CHECK AND LEAK CHECK GOOD.