As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BLEED DUCT WARNING MSG AT APPROX 11000. MSG STAYED ON MORE THAN 30 SEC DESCENT IN 10000. COMPLETED QRH RETURNED UNPRESSURIZED. TROUBLE SHOT SYS FOUND CERAMIC INSERT AT MT137P2 BAD. R & R INSERT SYS. OPERATIONS CHECKED GOOD IAW AMM 36-21-00.