As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE SCREWS ATTACHING THE ELECTRICAL WIRES TO THE MICROSWITCHES FOR THE RIGHT FUEL SELECTOR CONTROL WERE ALL FOUND LOOSE. THIS WAS CREATING A HIGHER RESISTANCE (MEASURED) WHICH MADE THE RIGHT FUEL GAUGE INDICATE MORE FUEL ON-BOARD THAN THERE ACTUALLY WAS.