As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT THE ENGINE OIL TEMPERATURE INDICATION WAS IN THE RED. UPON AIRCRAFT RETURN, THE THERMOSTATIC VALVE P/N SL E19600 AND THE OIL FILTER ADAPTER 204418-156WAS REPLACED. RUN UP CARRIED OUT. TEMPERATURE INDICATION WITHIN LIMITS, P/N 69510.