As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 4926776) DURING BOARD I WAS NOTIFIED OF A LARGE FUEL SPILL OFF OF THE RIGHT WING. THIS WAS A FUEL SPILL EVENT AND NOT A LEAK. SPILL OCCURRED DURING FUELING PROCESS. AMOUNT OF SPILL CONSISTENT WITH FUELING AT HIGH PRESSURE AND REACTION OF FUELING VALVES. VERIFIED OPERATION OF FUELING VALVES IAW B737 AMM 28-26. FUEL QTY VERIFIED VIA STICKS IAW B737AMM 28-41.