As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PAX BOARDING APU STARTED AND A/C PACKS TURNED ON . AFTER APPROX. 5 MINUTES WE SMELLED JET EXHAUST/ JET A FUMES IN CABIN. SHUT DOWN APU AND SMELL/ FUMES DISSIPATED WITH GROUND AIR CONNECTED. FOUND FUEL LEAK AT NO 1 ENG. FUEL/OIL COOLER AFT SIDE. R/R O-RING ON FUEL LINE. RAN IDLE LEAK CHECK NO LEAKS. C/W NO GO ODI CHECK LIST 2172. C/W W/ 37, 7100-2619 NO ODORS PRESENT. (LP5548976)