As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTED THAT DURING CLIMB THE LT ENGINE TEMPERATURE WAS FLUCTUATING AND INDICATING HIGH. THE POWER WAS REDUCED AND THE TEMPERATURE STABILIZED. THE ACFT RETURNED TO THE DEPARTURE AIRPORT WHERE AN UNEVENTFUL LANDING WAS MADE. TROUBLESHOOTING IS ON-GOING.