As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DEPARTED MAO 1200Z, AT 1412Z PRECAUTIONARY INFLIGHT SHUTDOWN OF NR 4 ENGINE DUE TO FLUCTUATING OIL PRESSURE BELOW 35 PSI, OIL PRESSURE LIGHT ILLUMINATED AND OIL QUANTITY DECREASED TO ONE GALLON. CONTINUED ON TO MIAMI. FOUND DIFFERENTIAL OIL PRESSURE SWITCH CRACKED. REMOVED AND REPLACED PRESSURE SWITCH AS PER MM 79-30-00, OPS AND LEAK CHECKED NORMAL.