As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER LEVELING AT CRUISE WITH CTR TANK FUEL PUMPS SHUT OFF, RH MAIN FUEL TANK DISPLAYED AMBER QTY AND IMBALANCE MESSAGE; RH ENGINE SHUT DOWN PER QRH AND EMERGENCY DECLARED, FLIGHT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. ACCOMPLISHED FUNCTIONAL TEST OF RH MAIN FUEL TANK FUEL QUANTITY INDICATION SYSTEM IAW AMM 28-41-00, OPS CHECK GOOD.