As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NR 3 ENGINE OIL TEMP GAUGE CLIMBED TO PAST RED LINE AND FLICKERED AS MUCH AS 50 DEGREES CELSIUS DURING DESCENT. ACCOMPLISHED ALTERNATE PROCEDURE AOM 5.174 PG 8, 9. CHECKED CONNECTOR AT TEMP BULB AND CLEANED SAME ON ENGINE. SWAPPED INDICATORS FOR TROUBLESHOOTING 2 AND 3. GROUND CHECKS GOOD.