As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER ENGINE START NOTICED BAD ODOR COMING FROM WEMACS. CABIN PAC SUPPLY TEMP RAPIDLY RISING AND CABIN FILLED WIT DARK SMOKE. EVACUATED AIRCRAFT AND TURNED PAC OFF AND TEMP SLOWLY STARTED TO DECREASE. R & R THE ACM IAW MM 21-51-00. OPS AND LEAK CHECKED GOOD.