As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START USING GROUND AIR START CABIN BEGIN TO FILL WITH SMOKE. ENGINE SHUTDOWN AND PLANE DEPLANED. MX INSPECTED ACFT, FOUND BOTH LT AND RT ACM (AIR CYCLE MACHINE) WATER SEPARATOR COALESCER BAGS CONTAMINATED WITH OIL, COALESCER BAGS REPLACED, GROUND RUNS PERFORMED WITH NO DEFECTS NOTED. (K)