What was found
NR 3 ENGINE LOSS OF OIL QUANTITY OSCILLATING OIL PRESS AND OIL PRESS WARNING ON AND OFF. SHUT DOWN NR 3 ENGINE AS PER ABNORMAL CHECKLIST OIL PRESS 15 PSI, 1 HOUR WINDMILLING. AIRCRAFT RETURNED TO KMIA UNEVENTFUL. INSPECTED ENGINE AND FOUND ENGINE OIL COOLER OIL LINE LEAKING. REMOVED AND REPLACED LINE IAW MM 79-1-5. INSPECTED MAIN OIL FILTER, FOUND CLEAN AND NO DEFECT NOTED. SERVICED ENGINE IAW MM 12-20-1. PERFORMED ENGINE OIL LEAK ON GROUND RUN UP, FOUND NO LEAKS AND ALL ENGINE PARAMETERS NORMAL IAW MM 71-00 & 72-00. AIRCRAFT RETURNED TO SERVICE.