As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, PILOT ENCOUNTERED A NR 1 ENGINE OIL TEMPERATURE INDICATION. A PRECAUTIONARY LANDING WAS MADE. MECHANIC DISCOVERED THAT THE NR 1 ENGINE OIL BYPASS VALVE WAS DEFECTIVE. A NEW VALVE WAS INSTALLED PROVIDING A RTS FOR THE AIRCRAFT