As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT NR 1 ENGINE OIL PRESS STARTED A GRADUAL CLIMB TO 80 PSI. WHEN ENGINE TORQUE WAS REDUCED TO 40 PERCENT OIL PRESS RETURNED TO NORMAL. INCREASING TORQUE WOULD CAUSE OIL PRESS TO INCREASE TO 95 PSI. WHEN TORQUE WAS REDUCED AGAIN TO 40 PERCENT OIL PRESS RETURNED TO NORMAL. AIRCRAFT RETURNED TO FIELD. REPLACED NR 1 ENGINE OIL PRESSURE TRANSMITTER.