As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT THE RIGHT HAND PACK FAILED. THE CREW FOLLOWED THE QUICK REFERENCE HANDBOOK THEN HAD A DUAL PACK OVERPRESSURE FAIL CAS MESSAGE. THE CREW DECIDED TO RETURN TO TYS. THE AIRCRAFT WAS FERRIED TO PIT WHERE MAINTENANCE REPLACED THE CROSS BLEED VALVE IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 21-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.