What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO MIA DUE OT THE FLIGHT CREW REPORTING AN ACT FUEL TRANSFER FAULT AT CRUISE. THE AIRCRAFT LANDED SAFELY AT MIA AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAITENANCE ACCOMPLISHED THE BITE OF THE FUEL QUANITY INDICATION SYSTEM PER AMM 28-42-00-740-001 WITH NO FAULTS NOTED. MAINTENANCE DID NOT IDENTIFY A SPECIFIC PART THAT WOULD HAVE CAUSED THIS FAULT MESSAGE.