As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI IN FOUND # 1 ENG LEAKING FUEL. GROUNDED - YES. PERFORMED IDLE LEAK TEST # 1 ENG FOUND A RUNNING LEAK AT THE FUEL PUMP DRAIN LINE. EXCEEDS SERVICEABLE LIMITS [4 OZ PER MIN]. REMOVED AND INSTALLED A NEW MAIN FUEL PUMP REF B737-9 AMM 73-11-01 PB 401. GROUND VERIFICATION GOOD DURING IDLE ENG RUN, NO LEAKS NOTED.