As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT 957 ON FLIGHT 9475 CLT TO RDU. ON CLIMBOUT NR 1 OIL TEMPERATURE WENT INTO RED. PILOT PULLED POWER BACK TO 60 PERCENT AND TEMP WENT INTO THE YELLOW. NO INFLIGHT EMERGENCY WAS DECLARED. AIRCRAFT RETURNED TO CLT AND LANDED WITH NO OTHER PROBLEMS. MAINTENANCE REMOVED AND REPLACED THE LEFT ENGINE OIL COOLER THERMAL BYPASS VALVE. OPS CHECK WAS GOOD.