As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMB THE OIL PRESSURE ON NR2 ENGINE, BEGAN TO FLUCTUATE BELOW THE MINIMUM OPERATING LEVEL. THE AIRCRAFT RETURNED TO DEPARTURE POINT, AT REDUCED POWER. POST FLIGHT INSPECTION FOUND THE OIL PRESSURE REGULATING VALVE TO BE FAULTY. THE VALVE WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.