As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LEFT BLEED DUCT RED MESSAGE. MADE AN EMERGENCY DESCENT, DIVERTED AND LANDED WITHOUT INCIDENT. MX INSPECTED AND FOUND LT BLEED LOOP B TO HAVE HIGH RESISTANCE. MX R & R INSULATOR AND PERFORMED CHECKS IAW ACFT MM. ACFT RELEASED FOR SERVICE.