As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) REPORTED LOSS OF OIL PRESSURE INDICATION AT TAKEOFF POWER SETTING FOR ABOUT 1 MINUTE. WHEN THE PILOT MOVED THE TLA TO TAKE OFF POWER SETTING, THE OIL PRESSURE INDICATION CAME BACK. PILOT ELECTED TO PERFORM A TURN AROUND AND LANDED AT POINT OF ORIGIN WITHOUT INCIDENT.