As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH LEFT TANK FULL, FUEL GAUGE READ 'ZERO' GALLONS. REMOVED SENDER AND CHECKED, OPERATION NORMAL. FOUND FUEL TANK BAFFLE BROKEN OFF AND LAYING ON BOTTOM OF TANK. SENDER PROBLEM TRACED TO FLOAT BEING CAUGHT ON LOOSE BAFFLE LAYING IN TANK. (REMOVED TANK FOR REPAIR).