As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PAC INOP. COULD NOT CONTROL TEMP AND FILLED THE CABIN WITH SMOKE. INSPECTED CABIN PAC FOR DAMAGE OR OIL LEAKAGE. NONE FOUND. IMPELLER ROTATES FREELY AND OIL LEVEL IS CORRECT. INSPECTED COALECER SOCK. SOCK WAS CLEAN. RAN APU FOR EXTENDED TIME. NO PROBLEMS NOTED. IAW MM CHAP 49-10-00 AND 21-60-00. RETURNED TO AIRPORT.