As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO INSTALLATION OF FUEL QUANTITY SENDER IN THE FUEL TANK, THE SENDER WAS CHECKED IAW THE AIRCRAFT MM. THE UNIT FAILED THE TEST BY HAVING ONE DEAD SPOT AND BEING OUT OF TOLERANCE AT UPPER MECHANICAL LIMIT. UPPER MECHANICAL LIMIT REQUIRED 45 OHMS + OR - 2 INDICATED 57 OHMS. THIS IS A O/H PART.