As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL IMBALANCE INDICATIONS. RAN FLIGHT WITH CROSSFEED OPEN AND LEFT PUMPS OFF. LEFT MAIN TANK QUANTITY INDICATOR SHOWS 600 LBS LESS THAN RIGHT MAIN TANK WHEN STICKS INDICATE BOTH EQUAL AND FULL. REMOVED AND REPLACED LEFT MAIN FUEL TANK UNIT PROBE F10 IAW AMM 28-41-21. OPERATIONAL CHECK GOOD. AIRCRAFT WAS GROUNDED.