As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT HAS FUEL ODOR IN CABIN. INSPECTED AND FOUND FUEL SEEPING INTO CABIN THROUGH FUEL PROBE WIRING CONDUIT. FOUND FUEL TANKS FILLED IN VERY COLD CONDITIONS AND THEN PLACED IN WARM HANGAR. FOUND CHECK VALVE WITH SOME DIRT IN IT CAUSING THE FUEL EXPANSION TO FORCE ITS WAY OUT FUEL CELL ACCESS PANEL INSTEAD OF OUTBOARD VENT.