As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED DUE TO DUCT 1 OVER TEMP CAS MESSAGE ILLUMINATED AT FL410. WHILE CONDUCTING QRH PROCEDURES, DUCT 1 OVER TEMP AND DUCT 2 OVERTEMP CAS MESSAGES ILLUMINATED CONDUCTED QRH PROCEDURE DESCENDED TO 10,000 FT PER PROCEDURE. AIRCRAFT LANDED WITHOUT INCIDENT. REMOVED AND REPLACED RAM AIR VALVE. OPS CHECK GOOD.