What was found
LOG PAGE 109685. DISCREPANCY: AFTER TAKE OFF ENGINE #3 OIL PRESS LIGHT CAME ON, OIL PRESS 50 Psi, PRESS 40 Psi WITH POWER LEVER @ IDLE, OIL TEMP INCREASED TO 128 C ENGINE SHUT DOWN IAW AOM ABNORMAL PROCEDURE. ENGINE SHUT DOWN AT 2352Z. AIRCRAFT RETURNED TO KMIA AND PERFORMED OVERWEIGHT LANDING 279,000 Lbs. CORRECTIVE ACTION: REMOVED AND REPLACED DIFFERENTIAL PRESS SWITCH IAW MM 79-33-1 PERFORMED ENGINE RUN UP AND FOUND NORMAL IAW MM 71-00. ACCOMPLISHED OVERWEIGHT LANDING INSPECTION IAW J/C 6372 NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.