As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: RIGHT MAIN FUEL TANK INCREASED FUEL BY 400-500 LBS DURING FLIGHT WITH NO CHANGE IN FUEL PANEL CONFIGURATION, EACH ENGINE WAS CONFIGURED TO BURN FROM EACH TANK SEPARATELY. ON DECENT, FUEL QUANTITY ON NUMBER 2 MAIN TANK WAS INCREASING, NO FUEL ON THE CENTER TANK. AND NO ABNORMAL FUEL USAGE ON NUMBER 1 MAIN TANK. POSSIBLE FUEL QUANTITY INDICATION PROBLEM. (OPEN)