As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE COMING FROM CABIN REGISTERS AND CABIN PAC WILL NOT DECREASE IN SUPPLY TEMP LESS THAN 215 IN AUTO OR MANUAL. FOUND CABIN ACM SEIZED. REMOVED ACM, INSTALLED REPAIRED ACM. REPLACED CABIN AND COCKPIT COALESCER FILTERS. OPS CHECKED CABIN PAC, CHECKED GOOD. ALL WORK DONE IAW AMM 21-51-00.