As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED FAINT SMELL OF FUEL WHEN BLEEDS WERE ON APU. MAINTENANCE INSPECTED AND FOUND LOOSE B-NUT ON APU FUEL CONTROL UNIT, FCU, SOLENOID IN-LINE. MAINTENANCE TIGHTENED B-NUT AND PERFORMED CHECKS IAW AMM AND CLEANED FUEL FROM AFT EQUIPMENT COMPARTMENT. ACFT RELEASED FOR SERVICE.