What was found
AIRCRAFT WAS GROUNDED: TANK FUEL IMBALANCE STARTED HAPPENING AT A HIGHER RATE THAN FUEL BURN FROM CENTER TANK AFTER TAKE OFF. UNABLE TO BURN CENTER TANK FUEL TO ARRIVE AT DESTINATION WITH SUFFICIENT FUEL AND BALANCED MAIN TANKS. AIRCRAFT DIVERTED TO IAH EMERGENCY DECLARED. LEFT CENTER BOOST PUMP REINSTATED. PERFORMED FUEL TRANSFER TEST, FUEL PUMP OPERATION, FUEL QUANTITY BITE, PUMP UFI TEST. ALL PASS, NO FAULTS NOTED.