As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A BLEED AIR DUCT RED CAS MESSAGE. AIRCRAFT DIVERTED AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT, REMOVED, AND REPLACED ISOLATOR MT138P2 USING AIRCRAFT MAINTENANCE MANUALS. OPERATION CHECKS WERE PERFORMED USING AIRCRAFT MANUALS AND AIRCRAFT WAS RELEASED FOR SERVICE.