As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO REFUELING AIRCRAFT, CREW NOTICED LEFT FUEL QUANTITY GAUGE WAS 1400 LBS HEAVIER THAN RIGHT. SUBMITTED SPECIAL FLIGHT PERMIT AND RETURNED TO BASE. FOUND LEFT MAIN FUEL PROBE BAD. REMOVED AND REPLACED FUEL PROBE, CALIBRATED FUEL QUANTITY SYSTEM. PERFORMED FUNCTIONAL CHECK FLIGHT, NO DEFECTS NOTED.