What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO MIA DUE TO POSSIBLE FUEL LEAK FROM ENGINE #1 OR LEFT TANK IN FLIGHT. THE AIRCRAFT LANDED SAFELY AT MIA WITHOUT FURTHER INCIDENT. MAINTENANCE ACCOMPLISHED LEAK CHECK OF LEFT WING FUEL TANK WITH FULL CAPACITY AS PER AMM 28-11-00. NO LEAKS NOTED. RAN ENGINE # 1 AT IDLE PER 71-00-00. NO LEAKS NOTED. ACCOMPLISHED BITE OF FQIS. NO FAULTS NOTED AND NO FAULTS STORED IN LAST FLIGHT. MAINTENANCE FOUND NO FAULTS.