As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE AT FL410 WHEN DUCT 2 OVERTEMP CAS ILLUMINATED. FOLLOWED CHECKLIST PROCEDURES BUT DUCT TEMP CONTINUED TO RISE, ULTIMATELY REACHING 232F. AFTER APPROXIMATELY 2 MINUTES, DUCT 1 OVERTEMP ALSO ILLUMINATED. AS WE DESCENDED THROUGH FL 240, TEMPS BRIEFLY STABILIZED, BUT DUCT 1 TEMP THEN STARTED CLIMBING AGAIN. MADE PRECAUTIONARY LANDING. FOUND RAM AIR VALVE BROKEN. REMOVED AND REPLACED RAM AIR VALVE ASSY WITH REPAIRED UNIT IAW AMM 21-23-03-400-801-A.