As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LEVEL-OFF AT FL290, DUCT 1 OVERTEMP CAS MESSAGE DISAYED. RAN THE QRH AND RETURNED AND LANDED WITH NR 1 ENGINE IDLED PER QRH. WE WERE ABLE TO SMELL THE HOT CONDITION IN. PERFORMED CMC DOWNLOAD AND SENT TO CONTACT CENTER FOR EVALUATION. CONTACT CENTER SUGGESTED TO SWAP TMV'S ONLY IF THE DISCREPANCY CAN BE DUPLICATED. PERFORMED ENGINE RUN OPS CHECKS AND WE COULD NOT DUPLICATE THE PROBLEM. PER MCCS REQUEST, RELEASING AIRCRAFT AS CND. REF AMM 21-61-02.