As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRE-FLIGHT INSPECTION REVEALED A STEADY FUEL DRIP FROM THE #1 ENGINE. INSPECTED AND FOUND MAIN OIL/FUEL HEAT EXCHANGER PAD DRAIN TO BE LEAKING 66 DROPS PER MINUTE. PER B737-900 AMM 71-71-00-200-801-F00 FOUND TO BE WITHIN DEFERRABLE LIMITS. PLACED ON PLT FOR 25 FLIGHT CYCLES. GROUNDED - YES. REMOVED AND REPLACED #1 ENGINE MAIN OIL/FUEL HEAT EXCHANGER REF B737-900 AMM 79-21-02/401. LEAK CHECK GOOD.