As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) SHORTLY AFTER T/O THE CREW NOTICED THE RH OIL TEMPERATURE HIGH. FLIGHT CREW ELECTED TO RETURN TO DEPARTURE AIRPORT, RH ENGINE OIL TEMP HIGH. NO EMERGENCY DECLARED. ON GROUND ENGINEERS TESTED THE OIL COOLER DOOR OPERATION, THIS PASSED. OIL COOLER BYPASS VALVE AND SEALS ON AOG ORDER. (TC# 20190503010)