As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING WALKAROUND FOUND NR 2 ENGINE LEAKING FUEL. GROUNDED-YES. DURING INSPECTION FOUND NR 2 ENGINE LEAKING FROM LEFT VSV DRAIN AND MAIN OIL/FUEL HEAT EXCHANGER PAD DRIVE, REF B737-900 AMM 71-71-00. RAN NR 2 ENGINE FOR 5 MINS FOUND MAIN FUEL DRAIN PAD LEAKING AT 10 DROPS A MIN THEN STOPPED. MAIN OIL FUEL HEAT EXCHANGER CONTINUED TO LEAK AT 12 DROPS, PER MIN AFTER 5 MINS OF RUNNING. REMOVED AND REPLACED MAIN OIL/FUEL HEAT EXCHANGE ON ENGINE NR 2, REF AMM 79-21-02. LEAK CHECK GOOD ON MAIN OIL/FUEL HEAT EXCHANGER. VSV ACTUATOR REQUIRES REPLACEMENT WITHIN 19 CYCLES.