As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLUCTUATING POWER SECTION OIL PRESSURE WAS IDENTIFIED DURING UPSHIFT FROM LOW TO HIGH RPM. THE POWER SECTION PRESSURE SCAVENGE PUMP ASSEMBLY WAS REMOVED AND THE POPPET TIP FROM THE PRESSURE REGULATOR VALVE WAS FOUND IN THE RETURN CAVITY OF THE PUMP BLOCKING RETURN OIL TO THE REGULATOR. THE SCAVENGE PUMP ASSEMBLY WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE.