As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL LEAKING FROM #1 ENGINE DRAIN MAST UPON ARRIVAL. GROUNDED - YES. GROUND RUN #1 ENG. FOUND FUEL LEAK AT DRAIN LINE (FUEL PUMP PAD) REF B737-9 AMM 71-00-00. REMOVED #1 ENGINE MAIN FUEL PUMP REF AMM TASK 73-11-01-000-801-G00. INSTALLED NEW #1 ENGINE MFP REF AMM TASK 73-11-01-400-801-G00. OP'S AND LEAK CHECK GOOD. NO FURTHER LEAK NOTED AT DRAIN MAST.