As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE, THE FLIGHT CREW NOTICED THE OIL TEMPERATURE INDICATION FOR THE RIGHT ENGINE WAS VERY ERRATIC. CREW CONTACTED MAINTENANCE CONTROL AND WERE ADVISED TO DIVERT TO COS WHERE REPAIRS COULD BE MADE. AIRCRAFT LANDED IN COS WITHOUT FURTHER INCIDENT. COS MX REPLACED THE RT ENGINE OIL TEMPERATURE SENSOR IAW AMM 79-32-01, ENGINE GROUND RUNS WERE SATISFACTORY.