As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG BURNING ODOR COMING THROUGH CABIN VENTS. ODOR WENT AWAY WHEN CABIN PAC TURNED OFF. FOUND CABIN ACM BLADES NOT TURNING. REMOVED AND REPLACED CABIN ACM TURBO COMPRESSOR, CLEANED DUCTING AND REPLACED CABIN COALESCER SOCK IAW MM 24-51-00. OPS AND LEAK CHECKED GOOD.