As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE ALTITUDE LT ENGINE EGT WENT TO 710 DEGREES. EGT STAYED AT 710 DURING THROTTLE RETARD DOWN TO IDLE RPM OR ABOUT 15 SECONDS. ENGINE WAS NOT SHUT DOWN. A/C DIVERTED TO YYT (ST.JOHNS). PERFORMED BORESCOPE AND RUN UP INSPECTIONS. RESTRICTED TO 60 HRS FOR REMOVAL PER FIM.