As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER AROUND 40 MINUTES IN CRUISE ABOVE FL220, RT ENGINE OIL PRESSURE DROPS FROM 130 PSI DOWN TO 110 PSI AND FLUCTUATES ACCOMPANIED BY OIL LOSS. AS SOON AS THE ALTITUDE GOES DOWN BELOW FL220, OIL PRESSURE GOES BACK TO NORMAL. AFTER PERFORMING ALL TROUBLESHOOTING.