As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L BLEED DUCT WARNING MSG WHILE CLIMBING THROUGH FL 210 / FOUND INSULATION MUFF FOR THE CROSS BLEED VALVE TORN. REMOVED AND REPLACED INSULATION MUFF IAW CRJ-700 AMM 36-13-15-400-801 AND 36-21-00-910-801. OPS TEST AND LEAK TEST GOOD. L BLEED DUCT WARNING MSG DID NOT RETURN