As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIMARY OIL LINE FROM ENGINE RUPTURED SOON AFTER TAKE OFF. PILOT NOTICED OIL PRESSURE LIGHT, AND IMMEDIATLY RETURNED TO BASE. UPON LANDING OIL PRESSURE GAUGE AND TORQUE METER READ ZERO. EXAMINATION OF REMAINING OIL LINE SHOWED SLIGHT PIMPLES ALONG LENGTH OF THE LINE. ONE OF THESE PIMPLES RUPTURED.