As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PUSH TAXI WALKAROUND, FOUND FUEL LEAKING FROM NR 1 ENG. GROUNDED - YES. OPENED NR 1 ENG FAN COWL, REF B737-800 AMM 71-11-02, AND FOUND FUEL LEAKING FROM FUEL HEATER SERVO COVER/END ASSEMBLY. REPLACED O-RING FOR END COVER ASSY ON FUEL HEATER SERVO, PER CMM 73-11-17. LEAK & OPS CHECK GOOD.