What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: SUSPECTED OIL LEAK IN THE NUMBER 2 ENGINE OIL QUANTITY WAS 12 QTS, AFTER TAKE OFF DRAMATICALLY DROPPED TO 9QTS, STAYED AT 9QTS FOR ABOUT AN HOUR. AFTERWARDS, IT THEN DROPPED TO 5QTS. THEN SLOWLY DECREASED BY 1QT EVERY 20 MINUTES. LOWEST OBSERVED WAS 2QT BEFORE LANDING. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT SJU. SERVICED ENGINE WITH OIL, PER MM 12-13-11. FOUND OIL SUPPLY TUBE LOOSE ON RIGHT HAND ENGINE. RETIGHTENED SUPPLY TUBE, PER MM 72-56-00. ACCOMPLISHED VISUAL CHECK OF MCD, PER MM 79-00-00. NO DEBRIS FOUND. RAN ENGINE AT 75%, PER MM 71-00-00. NO OIL LOSS SEEN.