As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST OIL PRESSURE AFTER TAKEOFF ON UPWIND LEG. REDUCED POWER. LANDED ON RWY 10, SHUT DOWN ENGINE AFTER LANDING. FOUND LOWER OIL COOLER HOSE ON LEFT ENGINE TO HAVE A HOLE. REMOVED AND REPLACED LEFT ENGINE OIL COOLER HOSE IAW MM 79-21-05. DOWNLOAD AND REVIEW OF FDR DATA INDICATED NO EXCEEDENCES.