As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO CONTROL TEMP RISE FOR CABIN PACK. SMOKE ENTERED CABIN ON LEFT SIDE OF CABIN AND TAIL CONE AREA SMELLED LIKE SOMETHING HAD BEEN BURNING. ACM WOULD NOT TURN. REMOVED AND INSTALLED AN OVERHAULED ACM. OPS AND LEAK CHECKS GOOD AT THIS TIME ALL WORK DONE IAW CESSNA 750 MM CHAPTER 21-51-00.