What was found
DIVERTED DUE TO DUCT OVERHEAT 1 AND 2 CAS MESSAGE. CREW RAN CHECKLIST, DECLARED EMERGENCY, DESCENDED TO 10,000FT, AND MASKS DROPPED. AIRCRAFT LANDED WITHOUT INCIDENT AT KLUK. REMOVED AND REPLACED THE RAM AIR VALVE (RAV) ASSEMBLY, IAW EMB 505 AMM 21-23-03/400. OPERATIONS AND LEAKS CHECK GOOD. P/N OFF 505-18030-407; S/N OFF 0000911280; P/N ON 505-17170-401; S/N ON 0001090555.