What was found
AIR TURN BACK, DUE TO FUEL 1 LOW LEVEL ON EICAS. NO OTHER INDICATION BESIDES EICAS MESSAGE. ALL FUEL QUANTITY INDICATION WERE NORMAL, ONCE AC FUEL PUMP 1 WAS SELECTED ON FUEL 1 LOW LEVEL EICAS WAS REMOVED FROM EICAS. FUEL 1(2) LO LEVEL WARNING EICAS MESSAGE, 1 INOP. R & R FCU IAW AMM 28-41-03, OPS CHECK OK.