As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING A GROUND RUN FOR CALIBRATION OF AN UNRELATED SYSTEM THE ENGINEER NOTICED A STRONG FUEL SMELL IN THE CABIN. THE SOURCE WAS FOUND TO BE A CORRODED HEATER FUEL LINE AT APPROXIMATELY FS 165. THE CARPET AHEAD OF PASSENGER SEAT NR 6 WAS SOAKED WITH FUEL.