What was found
DURING CRUISE FLIGHT, ENG CONFIG, EICAS MSG CAME ON TWICE DUE TO FUEL IMBALANCE BUT IMBALANCE RETURNED. LT TANK WOULD GO LOW & RT TANK HIGH. EACH TIME, FUEL CONFIG, MSG WOULD COME ON. R & R LT AUX TANK OVERRIDE FUEL BOOST PUMP IAW AMM 28-22-06. OPERATIONS CHECKED LT AUX OVERRIDE PUMP IAW AMM 28-22-05, NO LEAKS OR DEFECTS NOTED.